No Cap/Capping: Cap is another word for lie. Saying “no cap” means that you aren't lying, or if you say someone is “capping,” then you are saying they are lying.

Why do people say no cap?

The expression no cap is slang meaning “no lie” or “for real,” often used to emphasize someone is not exaggerating about something hard to believe.

What does cap mean in slang?

The expression “cap” is slang meaning “lie” or “bullsh! t” The expression “no cap” is slang meaning “no lie” or “for real,” The expression “capper” is slang meaning “liar” or “faker”