Porking someone really, really aggressively in the arse. So much so that one could easily imagine the vertebrae in their spine being crushed making a rather pleasant warm feeling in my trousers... I mean a crunching sound in their spine. Sorry.
Down at the beach (probably alone), "Jesus! Look at how smooth her skin is. The one in the green bikini. I'd like to spine crunch her good and proper. Yeah, 'cos women are things."