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Bum

Your bum, formally buttocks, is the fleshy part of your body you sit on. It's at the bottom of the back but above the back of the legs. Your bum has a cleft or crack down the middle which has an anus in about the middle of it. Your bum is a private part ?.

The bum can be used for sex or just admired as part of sexual activity.

I'm told that the bum evolved to remind people of ripe fruit to help it be attractive.

Slang and euphemisms

So many euphemisms...

buns
butt
ass (swear word)
posterior
fundament
bottom
cheeks
backside
rear end
tuchus (from Yiddish)
tush
hindquarters (derogatory apparently)
keister
seat
rump
fanny
derrier
caboose