rocket donkey punch
It's like a donkey punch, but instead of injaculating in her anus after hitting her in the back of the head, you stick your arm in her anus more than 4 times.
Matt: Rocket donkey punch that shit man!
Andrew: What's that?
Matt: Smack her in the back of the head and stick your arm in her ass 4 times!!
Andrew: Ahhh!!
Andrew: What's that?
Matt: Smack her in the back of the head and stick your arm in her ass 4 times!!
Andrew: Ahhh!!