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Definition of bum : 1. A humming noise.
2. The buttock.
3. To make murmuring or humming sound.

Synonyms:

croup, cheesy, schlock, dirty dog, back tooth, bum around, gadabout, horse around, cadge, nookie, after part, female genitalia, so-and-so, scram, mill about, claim, purposeless, sordid, bathroom, arse about, prat, junky, footle, tooshie, vomitus, useless, betrayer, tail, buns, lousy, punk, privy, flashy, shag, inferior, ask for, coarse, chintzy, hiker, loll around, bottomland, low-grade, buttock, rear, hindquarters, john, unjust, bum about, second-rate, order, butt end, loiter, masturbate, sens, lemon, informer, jack off, epicure, jerk off, tacky, tin, buzz off, hang around, mediocre, beg, weed, fool around, miserable, hind end, green goddess, merchant ship, study at tramp, throne, scrounge, cut-rate, hiking, can buoy, squalid, female genital organ, unjustified, stern, trashy, blabber, rubbishy, low-rent, gaudy, musk turtle, undersurface, arse, hike, loud, underside, butt, back end, sybarite, inexpensive, shadower, panhandle, dope, pot, insist on something, keister, scum bag, rump, stateless, stooge, industrious, stool, mess about, cheek, swinger, chinchy, no-good, sess, el cheapo, back, diddle, squealer, ass, screwing, cheap, frig around, bottom, git, bugger off, gimcrack, arsehole, loaf, roll in the hay, pathetic, laze, groundwork, common, bon vivant, rear-end, homeless, tawdry, tail end, skunk, linger, invite, fundament, bargain-basement, barf, bed, fag end, place, scab, partial, unfair, can, demand, cigarette, sluggard, schnorr, stub, foundation, grass, lurk, do-nothing, cigaret, lounge around, tramp steamer, lump, crumb, backside, tarry, stinker, fanny, seat, poor, pointless, gage, down-and-out, tin can, bad, strikebreaker, basis, wrongful, meretricious, sponge, garish, appeal, grub, crummy, gourmet, mill around, lavatory, defective, goat, potty, arbitrary, commode, idle, sleazy, tush, lowlife, waste one's time, wretched, female genitals, nooky, rotten, bag lady, lav, tatty, target, parasite, canful, ineffective, derelict, arse around, piece of tail, quarter, shoddy, butt joint, laughingstock, flotsam, crappy, biased, lounge about, wood pussy, gourmand, gypsy, lounge, futile, lollygag, passenger, brassy, lallygag, cornerstone, rotter, merchantman, tinny, plead, freighter, shutout, substructure, inefficient, goof, shnorr, nates, faulty, puke, get, hedonist, derriere, do-little, toilet, screw, locoweed, slug, voluptuary, croupe, polecat, smoke, seamy, worthless, droop, fool, behind, flash, unreasonable, loll, street people, cheapjack, blackleg, she-bop, connoisseur, foot, crapper, posterior, shtup, vomit, coffin nail, shirk, tramper, one-sided, trumpery, slugabed, base, bottom of the inning, poop, unequal, bunghole, understructure, tail assembly, piece of ass, deadbeat, seedy, empennage, terrible, buttocks, rat, shadow, stinkpot, wank, asshole, request, execrable

idler, slacker, good-for-nothing, couch potato, mooch, beggar, layabout, panhandler, slouch, lazybones, ne'er-do-well, slowpoke, loiterer, lingerer, moocher, drone, loafer, lounge lizard, wastrel, sloucher, clock watcher, hobo, dawdler, mendicant, scrounger, tramp, goldbrick, dilly-dallyer, vagrant, sponger, goof-off, mope, freeloader

mess, pigpen, slob, pig, boor

Usage examples:

• You see, Fort Duggan, they reckon, is a bum sort of location, eaten up by bugs an' a poor sort of neche race. - "The Heart of Unaga", Ridgwell Cullum.
• Breakfast was beyond him, although Mr. Robey, his attention drawn to Don by Harry Walton's innocent " You're looking pretty bum, Gilbert," counselled soft boiled eggs and hot milk. - "Left Guard Gilbert", Ralph Henry Barbour.
• That bum excuse for a man! - "The Rangeland Avenger", Max Brand.