It means usually, “for real”, “On God” , “No Flex”. Basically, it is to describe something of exponential magnitude to a person. Normally used to describe jewelry that costs hundreds of thousands of dollars, a new rarri you bought off the lot, or something you can obtain with ease and if isn’t nothing to someone like you.

A phrase that is akin to “it is true that” or “I think that”, “no cap” is often used to describe an opinionated statement or a statement that is believed to be true. Stemming from the verb capping (basically, “to lie”), it quite literally means “no lie.” Because of this, no cap can be used to describe something that is not thought to be true by the speaker’s audience. No cap can be used to describe factual statements, but due to its slang nature, it is most often used in an exclamatory manner.

Slang for "no lie" or "for real" 🚫🧢

No Lie , On god, a form of telling the truth when someone doesnt believe you

Not lying/ not tripping/ telling the truth periodt

No lie or not lying

Taken from the popular Twitch.tv phrase/emote "Kappa" which means you're joking. Was later shortened to "Cap" outside of Twitch with the phrase being picked up and popularized by influencers.