anus, arse,
ass, behind, backside, booty, bottom, bum, buns,
butt, buttocks, can, derriere, dorsal,
fanny, fundament, heinie, hindquarters, hind end, keister, posterior, prat, rear, rear end, rectum, rump, sphincter, stern, seat, tail, tail, tooshie, tuchus, tush
"Daddy, what do I do with this
fudgesicle?" ... "Well, Jonny, you can stick it in your
bum bum".