A person who ‘slips over’ and lands on a bum/arse/bunda/cheeks and simple opens his mouths and wiggles his tongue in a circle formation while slurping up all that ‘bunda’.
John: *crying*
Harry: “Dude, why you crying?”
John: “It’s rob, he’s slurped my girls bum.”
Harry: “Shit dude! I always thought he was a ‘bum slurper’.