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

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

bumflap 

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