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.
by LynchingNemo January 23, 2008
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
by iloveumore+more+more April 12, 2006
by GemmaDude November 7, 2007
A piece of string that goes from the buttocks to the clit. It is nailed in both ends used as a fashion accessory.
Can I see your clitty bum flap?
Who nailed your clitty bum flap?
That's such a cool clitty bum flap!
Who nailed your clitty bum flap?
That's such a cool clitty bum flap!
by d0ugie29 August 18, 2016