What is "m-word"

alt. 1 (context euphemistic English) The word ''motherfucker'', regarded as a vulgar or taboo word. 2 Any word beginning with ''m'' that is not normally taboo but is considered (often humorously) to be so in the given context. n. 1 (context euphemistic English) The word ''motherfucker'', regarded as a vulgar or taboo word. 2 Any word beginning with ''m'' that is not normally taboo but is considered (often humorously) to be so in the given context.