Raging butt sex is when your step-father comes home from a long day of work drunk as all hell and decides to beat you until you either lock yourself in the closet or run away crying and pissing your pants. after this he turns his attention towards your mom, not even noticing that she got her hair done today, but instead in a drunken rage because he no longer has you to molest he has his way with your mom's anus tearing the shit out of it until she's bled so much there is no use for lube. after he blows his load and pukes on her back he then passes out as your mom experiences orgasm after orgasm shaking her body all over.
(drunken step dad): I'm gonna give you raging butt sex
(your mom):alright I'm just healed from last week's session lets go.