Green’s Dictionary of Slang

buffy n.2

[buff adj.2 (1), reinforced by TV show, Buffy the Vampire Slayer]

a muscular woman or girl.

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[US]Eble Campus Sl. Mar. 2: buffy – pretty girl [...] Look at the way she bops around campus. She’s such a buffy.
Online Sl. Dict. 🌐 Buffy n 1. a muscular female. Origin: the movie/ television series Buffy, the Vampire Slayer. (‘Buffy over there could kick your ass.’).