Definitions by SOFGNAG

No Cap 

means that you’re not lying and are being serious. originated from the twitch emote Kapp and non twitch users started using it as “Cap” after hearing twitch users started saying it in public.

“I won’t leave after we smash no cap”
or
“You cappin’ thinkin’ you gonna graduate elementary.”

No Cap by SOFGNAG April 30, 2019