the fleshy part of the human body that you sit on(noun.body)
Synonym:arse,
ass,
backside,
behind,
bottom,
bum,
buns,
butt,
buttocks,
can,
derriere,
fanny,
fundament,
hind end,
hindquarters,
keister,
nates,
posterior,
prat,
rear,
rum
source: wordnet30
