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A bumsend is a person who acts like an idiot to gain attention or does something so ridiculous there's no other word for their ridicuality.
Friend 1
'Mate don't knock over the beers or you'll be paying for them'
Friend 2
'No problem man, I see them'

2 minutes later knocks over beer

'OHHHH dude you're such a fucking bumsend, get out!'
by plumber80 August 30, 2011