It holds your legs onto your torso and acts as a counterbalance.
its bum its bum
bum
your hair
your bum hole
his bum?
my bum
it is for some people............ha ha for them!
Cuba's most important river is up my bum to the left! from Agent J
bum bum
No. On any bird, the rump is the part of the body immediately above the tail.
it makes your bum bum all wet and soggy
depends what you mean by interesting. I know the bum muscle is the biggest though