MCYM Share definition Flag This is an acronym for a put down or invitation to a male/female meaning "My Cock Your Mouf". Seth yelled at the woman "ahhh MCYM my young fine lady!" "Oh yeah, MCYM mother*%#&%! MCYM by Justin Leader December 7, 2006 0 0 Get merch Get the MCYM mug. Buy Now — $32.95 See more merch
