what cap

The word "cap" has multiple meanings. It can refer to a type of headgear, a slang term indicating a lie or falsehood, or an interest rate limit on a variable rate credit product. The slang term "cap" originated in African American Vernacular English (AAVE) and is used to indicate when someone is lying or telling the truth. It is often used in the phrases "no cap" (meaning "no lie") or "all cap" (meaning "all lies")