Cap

Definition:

A lie, falsehood, or exaggeration, with the opposite "no cap" indicating complete honesty or sincerity

Context:

The slang use of "cap" originated in African American Vernacular English (AAVE) tracing back to the 1900s. The term rapidly gained mainstream popularity in 2017 through hip-hop culture, spreading through Atlanta rap circles before being widely adopted by Gen-Z.

See the following uses:

Cap: A lie or exaggeration or something contested
Capping / Cappin': The act of deliberately lying or exaggerating
No Cap: Expressing / swearing that you’re honest or completely serious about something
That’s Cap: Catching someone in the act of lying or expressing disbelief in something
Stop Capping: A request to ask someone to stop lying or exaggerating
🧢: A shorter way to represent "cap" via emoji when texting

Example:

^{(all names & events in the
following scenario have been made
up)}

Dayvid: “Is my haircut bad?”

Ryelee: “No...”

Dayvid: “Phew, I was worried—”

Ryelee: “...no cap, you look like you lost a fight with a lawnmower”