Entry 2 senses · 2 variants Webster, 1913 fucking · IPA /ˈfʌkɪŋ/ n. adj. 01 n. the act of sexual intercourse. 1. the act of sexual intercourse.[vulgar slang] Syn. fuck, screw, screwing, ass, piece of ass, roll in the hay, shag. 02 adj. unpleasant; annoying; -- also used as an informal intensifier. 1. unpleasant; annoying; -- also used as an informal intensifier.[Vulgar slang, prenominal] Syn. bally(prenominal), blinking(prenominal), bloody(prenominal), crashing(prenominal), flaming(prenominal).