Forcing someone / something into a bath and cleaning / washing them.
1: The other night i wanted to give my pet a fucking bath
2: Oh yeah, did you clean it?
1: Nah, the little prick didn't want one, so i gave it a Bath Rape
2: Ah, fuck yeah!!!!
1: I heard you were gonna give your baby a bath the other day....
2: Oh ye, Nah, my baby didn't want a bath, so i was pretty fucking pissed off!
1: What did you do in the end?
2: I gave my baby a bath rape.
1: Lol haha
2: Shut The Fuck Up, you CUNT!!!!