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Definition of backside : The hinder part, posteriors, or rump of a person or animal.

Synonyms:

goat, rat, cheeks, cigaret, puke, piece of ass, booty, canful, scum bag, arsehole, butt joint, idler, tail end, lavatory, bottomland, stub, laughingstock, female genitalia, poop, git, lowlife, loafer, tooshie, bed, can buoy, underside, do-nothing, empennage, haunches, substructure, merchant ship, undersurface, stooge, butt end, basis, stinker, shadow, hunkers, place, can, breech, layabout, crapper, tramp, rotter, screw, so-and-so, back tooth, commode, hobo, cheek, tush, toilet, screwing, croupe, shtup, back end, fundament, understructure, buttock, stinkpot, bottom of the inning, quarter, nookie, prat, coffin nail, groundwork, hindquarters, ass, freighter, stool, shag, privy, base, butt, piece of tail, target, lav, rear-end, cigarette, heinie, croup, arse, foundation, roll in the hay, fag end, after part, bathroom, hams, buttocks, merchantman, bum, foot, shadower, john, bunghole, female genital organ, potty, buns, cornerstone, nooky, dirty dog, keister, skunk, crumb, tail assembly, throne, hind end, tin can, nates, tin, asshole, bun, duff, over, female genitals, pot

bottom, rump, stern, derriere, tail, behind, seat, fanny, caboose, hind, back, posterior, rear

Usage examples:

• And this backside haven, These desirable twin promontories, the Maliac, And then of course these Megarean Legs. - "Lysistrata", Aristophanes Commentator: Jack Lindsay.
• Dahn squats one on his backside an' writes something in 'igh words. - "The Burning Spear", John Galsworthy.
• My backside might be in a swivelchair, but my soul would be right up here. - "Greener Than You Think", Ward Moore.