英语词源字典 - 在线词源网站

buff (adj.)[buff 词源字典]: "well-built, hunky," 1980s, from buff (v.) "polish, make attractive."[buff etymology, buff origin, 英语词源]
built (adj.): 1560s, "constructed, erected," past participle adjective from build (v.). Meaning "physically well-developed" is by 1940s (well-built in reference to a woman is from 1871); Built-in (adj.) is from 1898.
stacked (adj.): 1796, of hay, past participle adjective from stack (v.). Of women, "well-built physically; curved in a way considered sexually desirable," 1942.