michigan hammer-arm Share definition Flag During the act of fellatio, right before climax, the man slams his fist into the top of his partner's head. Son, take the wheel while I give your mother a Michigan Hammer-arm in the back seat. michigan hammer-arm by Atherious March 16, 2019 0 0 Get merch Get the michigan hammer-arm mug. Buy Now — $32.95 See more merch
