Top Definition
It is a piece of fabric about 13x13 hanging from the waist covering the butt (the front/sides)sometimes with d-rings, usually plaid or pinstripe, mostly worn by the punk community.
Girl 1: Woah, that bum flap goes great with his bondage pants

Girl 2: ... no bitch.
von LynchingNemo 22. Januar 2008
When an arse is so emmense that the cheeks turn into flaps. Can be used as a negative term.

Jeff: Damn that girls so huge shes got bumflaps!


Jim: you missed the strippers and free beer.
Pete: oh bumflaps.
von DazCorp 28. Februar 2005
The flaps inside your anus.
Dude uve got the biggest bum flaps ever!

Awww bamflaps i forgot my phone
von GemmaDude 7. November 2007
It's underwear. Is there anything else to know?
I lost my bumflap, where could it be!
von He who likes Bukkake 2. Februar 2005
a bum flap is wen a girl has a really really short skirt, thats rolled over so many times, its like a really thick belt, and so instead of being a skirt .. is a bumflap! (you see the link...), i.e. nothings left to the imagination, especially on a windy day...bumflaps are very common in secondary schools with the *were not even gonna hide were desperate for a shag* kinda girls
"Oo Gladys look at that bum flap...the youth of today!"
"I dont know about that.. i quite like it!"
von iloveumore+more+more 12. April 2006

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