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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!"
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

bum flaps 

The flaps inside your anus.
Dude uve got the biggest bum flaps ever!

Awww bamflaps i forgot my phone
bum flaps by GemmaDude November 29, 2007

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
It's underwear. Is there anything else to know?
I lost my bumflap, where could it be!
bumflap by He who likes Bukkake February 2, 2005
Sonion comes from a GIF that is a mix of the word son and onion ( if you use this slang you like dih)
Man 1 says "I drank last night I need a break" Man 2 "Sonion"
Sonion by popularloner67 March 11, 2026
Word of the Day on June 4, 2026