no cap

Meaning

1. Said to affirm that a statement is true, not exaggerated.
2. Used to add emphasis to an impressive claim.

“That was the best burger I’ve had all year, no cap.”

Where it came from

Built on “cap,” African American Vernacular English for lying or boasting, a usage documented since the early twentieth century. Southern hip-hop, including a 2017 Future and Young Thug track titled “No Cap,” pushed the phrase into wider use before it became standard Gen Z and Gen Alpha slang. cap