The fleshy part of the human body that you sit on
Arse
Ass
Backside
Behind
Bottom
Bum
Buns
Butt
Buttocks
Can
Derriere
Fanny
Fundament
Hindquarters
Keister
Nates
Posterior
Prat
Rear
Rear end
Rump
Seat
Stern
Tail
Tail end
Tooshie
Tush
Body part
Body
Torso
Trunk