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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.
bum flap by LynchingNemo January 22, 2008
Related Words

Clitty Bum Flap 

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!
Clitty Bum Flap by d0ugie29 August 17, 2016
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!"

Bumflaps 

When an arse is so emmense that the cheeks turn into flaps. Can be used as a negative term.
Description

Jeff: Damn that girls so huge shes got bumflaps!

Negative

Jim: you missed the strippers and free beer.
Pete: oh bumflaps.
Bumflaps by DazCorp February 28, 2005

Utility beer 

Utility beer is the beer you keep around for the day-to-day moments when beer is a necessity to assist in pedestrian activities (golf, plumbing, yardwork, babysitting, staff meetings, Zoom calls). For the beer snob it is the beer you save for neighbors when they drop in at 3 p.m. on a Tuesday. It is differentiated from the actual high-end beer you save for special events, holidays, and special tastings.
Person 1: Dave, did you bring along those hazy craft IPA's so we could drink while cleaning Lyle's pool?
Person 2: Nope. I just have a bunch of utility beer that Steve dumped on me. Good enough for this. It is only 10:30 a.m.
Utility beer by lakeshore February 1, 2022
Word of the Day on August 10, 2026
Police activity, especially of the non-productive type i.e. The act of setting up and patrolling speed traps, harassing or arresting people based on appearance (racial profiling), breaking up parties, any sort of cannabis bust, etc.
"Did you see all the cops on highway 6? They are oinking hard!"

"I hope Johnny doesn't get caught with his bag of weed, the pigs are oinking"
Oinking by DontDrinkSoda June 29, 2013
Word of the Day on August 9, 2026