Green’s Dictionary of Slang

1. drunk.

1821		W. Scott Pirate II 296: Why, he has sucked the monkey so long and so often [...] that the best of him is buff’d.
1984		Partridge DSUE (8th edn) 147/1: C.19.

2. physically fit, well muscled.

1959		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.
1989		P. Munro Sl. U. 47: Joe’s the buffedest guy I know.
1998		K. Anderson Night Dogs 33: ‘You’re looking buffed, looking bad. Working out [...] right?’.
2000		P. Temple Dead Point (2008) [ebook] A buffed-up person wearing three grand’s worth of the shop’s stock.
2007		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.
2015		P. Beatty Sellout (2016) 8: Some buffed ancient Greek frat boy.