English

fly-ass

From fly + -ass.

Formed from fly + -ass

Proto-Indo-European *plew- ‘to fly, flow, run’

…

Proto-Germanic *fleugǭ ‘flying insect, fly’

Proto-West Germanic *fleugā ‘fly’

Old English flēge ‘a fly’

Middle English fflye

English fly

Today it means

adj Very smart, beautiful, or well-dressed.

Language periods are conventional ranges, not dates for this word.