"Man that guy is so fly bum, check out his trainers and his dog"
by Stu Brandom May 26, 2004
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Any flying insect which can be found hanging around the anus of cattle / sheep and / or welshmen.

Have been known to descend to feast upon shite from said critters arses.
Look at the way the bum bum fly just hangs there...
by urbankhaos May 6, 2003
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