Definition

Lying, exaggerating, or being dishonest; making false claims or statements to mislead others.

Example Usage

He said he benched 400 pounds, but he's definitely capping—I've seen his gym videos.

Origin

Originated in African-American Vernacular English (AAVE) and hip-hop culture; the 'cap' metaphor refers to covering something up or hiding the truth.

Fun Fact

The antonym, 'no cap,' became a popular assertion of truthfulness, sometimes abbreviated as 'fr fr' (for real, for real) or used on its own as emphatic confirmation.

Source: Definition backfill (hailey)