Green’s Dictionary of Slang

buffed adj.

[SE buffed up, polished, in sense 2 via workout sessions at a gymnasium, thus buff adj.2 (1)]

1. drunk.

[UK]W. Scott Pirate II 296: Why, he has sucked the monkey so long and so often [...] that the best of him is buff’d.
[UK]Partridge DSUE (8th edn) 147/1: C.19.

2. well muscled.

[US]T.C. Bambara ‘Sweet Talk’ in Gorilla, My Love (1972) 123: We were made for celluloid – beautifully chiseld are we, not to mention well-buffed.
[US]P. Munro Sl. U. 47: Joe’s the buffedest guy I know.
[US]Bentley & Corbett Prison Sl. 31: Buff Up also Buffed To add muscle mass to one’s body by rigorous weightlifting exercises.
[US]Da Bomb Summer Supplement 3: Buffed (adj.) Physically fit, muscular.
[Aus]P. Temple Dead Point (2008) [ebook] A buffed-up person wearing three grand’s worth of the shop’s stock.
[US]W. Ellis Crooked Little Vein 234: I’ll bet he’s already bust a nut once and is still digging away to prove what an incredibly California buffed-and-tanned physical specimen he is.
[US]P. Beatty Sellout (2016) 8: Some buffed ancient Greek frat boy.