def

Definition

Slang term meaning excellent, great, or cool; an expression of approval commonly used in hip-hop and urban culture since the 1980s. Can also be used as a standalone exclamation or as an intensifier.

Example Usage

That album is def; I've been playing it all week.

Origin

Possibly derived from the adjective 'definite' or related to the musical term 'definition' for crisp sound quality.

Fun Fact

Popularized by the band 'Mos Def' and became a staple of 1980s–90s hip-hop vocabulary.

Source: Definition backfill (hailey)

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