The behind of a British bum. Can be used to describe a person from Great Britain.
"Ey mate, bloody cold outside, ey?"
"Dude, you're such a bum arse."
by bumarse October 16, 2009
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1. The behind of a British bum. Can be used to describe a person from Great Britain.

2. Soreness or numbness of the ass from prolonged sitting.
1.
"Ey mate, bloody cold outside, ey?"

"Shut up, bum arse."

2.
"Dude, been sitting on the couch for 3 days straight."
"Wow, you must have a real bum arse!"
by bum arse October 16, 2009
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