Taken from the words bum and toucher. A bum toucher can be defined as someone who touches either alot of bums or perhaps one frequently. It can also be used to describe somebody who touches thier bum with other or perhaps their own.
They could also be known as an "ass feeler"- somebody who takes it upon themselves to feel others bums without their concent, which is frankly quite rude.
"Have you been touchin bum?eh eh cheeeky!"
"errgh you big bumtoucher"
When your walking down the street, maybe with a friend. And you see a bum just sitting, standing, or laying down. You step back, take a deep breath, and sprint toward the bum at full speed. once close, you crossbody him in mid-air, once on the ground you beat the living fuck out of the bum. BUMRUSH.
"Hey jen, do you wanna see me bum rush that bum over there?"
"DAMN. honey, did you see that guy bum rush that bum?"
A boy who is, weird, boring, stupid, gross, ugly, has no friends, can't get a girl to have sex with him, thinks he's awesome when he's really just a loser, gets drunk a lot, is poor, his family hates him, he is a nobody.
Girl: eww! Look at that boy! He's such a bum bucket!