What does wallahi mean in slang?

I swear, honestly, I'm not lying. It's Arabic for "by God," used in London, Toronto and online to insist that what you're saying is true.

What does "say wallahi" mean?

Swear it. It challenges someone to back up a claim with an oath: if it's true, say wallahi.

Yes. It is Arabic wa-llahi, "by God," an oath in God's name. It spread into English youth slang through Muslim communities, including Somali speakers in Toronto and London.

What does wlhi mean in text?

It's a texting abbreviation of wallahi, with the same meaning: I swear. It is noted as especially common in Somali communities.

Is wallahi the same as istg?

They do the same job in a sentence, but they aren't equal. Istg is a casual English idiom. Wallahi is an actual oath in Islam, so many Muslims treat it with more care.

Why do some Muslims object to people saying wallahi casually?

Because it is a real oath sworn in God's name. Many Muslims consider it wrong to use it as filler, as a joke, or to back something untrue.

wallahi

[ wah-LAH-hee ] /wɑˈlɑhi/ (stress on the middle syllable)

interjection

Wallahi is Arabic for "by God," an oath that you are telling the truth. In London and Toronto slang it means "I swear" or "honestly."

wallahi has 3 meanings. Jump to: [The oath] [I swear, honestly] [The 2026 meme sound]

type interjection since 2004 seen on tiktok, twitter-x, irl, texting, instagram status current

Can you still say it?

wallahi is current: in active, unremarkable use. Safe to say right now.

What does wallahi mean?

1.
The oath: Arabic wa-llahi, literally "by God": an oath sworn in God's name that what you say is true, or that you will keep a promise. In Islam it is a real oath, and many Muslims hold that it should not be used casually or falsely.
2.
I swear, honestly: In London and Toronto youth slang and wider online use, an emphatic "I swear" at the start or end of a statement. "Say wallahi" is a challenge: swear it.
3.
The 2026 meme sound: A TikTok audio, "say wallahi bro," taken from a 2023 livestream clip and used as a reaction of disbelief.

Wallahi is first of all an oath. In Arabic it means "by God," and saying it puts God's name behind your words. For Muslims that is serious. Many hold that it should only be said when you are telling the truth and mean it. Using it as filler, or to back a lie, is seen as wrong.

In slang it has a lighter job. In London, in Toronto and across social media, wallahi means I swear, honestly, I'm not lying. "Wallahi I was at the library till it closed." It goes at the start or end of a sentence, the way istg or ong would. "Say wallahi" turns it around: swear it, then, if it's true.

Both uses are alive at once, and that is the thing to know before you say it. To the friend next to you it might be a throwaway. To someone who grew up with it as an oath, a casual wallahi can sound careless. Many Muslims object to hearing it used as a joke, or by people who don't mean it.

In texts it is often shortened to wlhi. Wallah is the same oath in its clipped everyday form.

Where did wallahi come from?

Wallahi is Arabic: the oath particle wa- plus Allah, literally "by God." It passed into many languages of Muslim communities, among them Swahili, Hausa and Ottoman Turkish, and it reached English youth speech through those communities, not through any one person.

In Toronto, research by the linguist Derek Denis traces the city's wallahi to Somali, which took it from Arabic. In London it is recorded as a Black British exclamation of affirmation, with a citation from 2004. Press accounts credit its spread there to London's Somali community, though no academic study of London speech that we found discusses the word.

The 2026 spike has a different source. A May 2023 clip of the streamer IShowSpeed repeating "say wallahi bro" became a TikTok sound that was popularized in March 2026 on TikTok. He popularized a sound. The word itself is centuries older.

More sources: wallahi - Wiktionary · wlhi - Wiktionary · The Arabic words that have made their way into London slang - MyLondon

How to use wallahi in a sentence

wallahi i was at the library till it closed, ask the librarian

my cousin said wallahi he'd be here by six and he walked in at 5:58

she told me say wallahi before she'd believe i got the tickets, so i know she takes that word seriously

In a conversation

you actually finished the whole essay tonight?

wallahi, submitted it ten minutes ago

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Don't confuse wallahi with

istg: Istg is a casual English idiom with no religious standing. Wallahi is an actual oath in Arabic and in Islam, so many Muslims treat it with more care.

Questions about wallahi

What does wallahi mean in slang?: I swear, honestly, I'm not lying. It's Arabic for "by God," used in London, Toronto and online to insist that what you're saying is true.
What does "say wallahi" mean?: Swear it. It challenges someone to back up a claim with an oath: if it's true, say wallahi.
Is wallahi Arabic?: Yes. It is Arabic wa-llahi, "by God," an oath in God's name. It spread into English youth slang through Muslim communities, including Somali speakers in Toronto and London.
What does wlhi mean in text?: It's a texting abbreviation of wallahi, with the same meaning: I swear. It is noted as especially common in Somali communities.
Is wallahi the same as istg?: They do the same job in a sentence, but they aren't equal. Istg is a casual English idiom. Wallahi is an actual oath in Islam, so many Muslims treat it with more care.
Why do some Muslims object to people saying wallahi casually?: Because it is a real oath sworn in God's name. Many Muslims consider it wrong to use it as filler, as a joke, or to back something untrue.