See also: fap English Pronunciation IPA(key): /ɛf eɪ piː/ IPA(key): /fæp/ Noun FAP (countable and uncountable, plural FAPs) (medicine, uncountable) Initialism of familial adenomatous polyposis. (countable) Initialism of fixed action pattern. Anagrams PFA, AFP, PAF, APF, FP&AWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads