no cap

No cap is a way to swear you are telling the truth. You can add it to a claim ("that test was easy, no cap") or use it alone as a reply. Either way, it says the speaker is not exaggerating. The reverse forms exist too. "Cap" or "that's cap" calls out a lie. "Stop the cap" demands honesty. The blue cap emoji does the same job without words.

The phrase started as insider slang, blew up as a Gen Z favorite, and then stuck. By 2026 it reads as established casual English. Teachers know it, brands use it, and teens still say it without irony. That is rare for a word used this heavily. Linguists often cite it, along with rizz and flex, as a textbook case of AAVE (Black American English) supplying words that get mislabeled "Gen Z slang."

The verb "cap" means to brag, exaggerate, or lie. Black Americans have used it that way for over a century. Dictionary records show the brag sense from 1905 and the lie sense from 1906. In the 1940s to 1960s, a back-and-forth insult game called "capping" kept the word going. The picture behind it is a cap as a top. To cap someone is to top them, so capping came to mean boasting. "No cap" flips that and promises zero exaggeration. The fixed phrase shows up on Twitter by 2012. It moved through AAVE (African American Vernacular English) and Atlanta rap speech before any song used it. Its mainstream breakout was "No Cap," the opening track on Future and Young Thug's 2017 mixtape Super Slimey. After that, Black Twitter and then TikTok carried it everywhere. No single coiner is documented. The 2017 song made famous a phrase AAVE already owned.