Your bum is your bottom. This word can also be used to refer to a vagrant, although it's generally considered offensive or insensitive.

Bum is a name sometimes given to a beggar or vagrant: someone who tries to bum change from you. This word can also be used as a general insult, as in "The Yankees are bums!" (if you're a Red Sox fan) or "The Red Sox are bums!" (if you're a Yankees fan). A false accusation is a bum rap. As a verb, bum is a term for lazing around, as in, "I didn't have any homework this afternoon, so I just bummed around and played video games."

Definitions of bum
  1. noun
    a disreputable vagrant
    “he tried to help the really down-and-out bums
    synonyms: hobo, tramp
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    dosser, street person
    someone who sleeps in any convenient place
    type of:
    drifter, floater, vagabond, vagrant
    a wanderer who has no established residence or visible means of support
  2. noun
    person who does no work
    “a lazy bum
    synonyms: do-nothing, idler, layabout, loafer
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    show 25 types...
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    clock watcher
    a worker preoccupied with the arrival of quitting time
    couch potato
    an idler who spends much time on a couch (usually watching television)
    dallier, dilly-dallier, dillydallier, lounger, mope
    someone who wastes time
    dawdler, drone, laggard, lagger, poke, trailer
    someone who takes more time than necessary; someone who lags behind
    daydreamer, woolgatherer
    someone who indulges in idle or absentminded daydreaming
    goldbrick, good-for-naught, good-for-nothing, goof-off, ne'er-do-well, no-account
    an idle worthless person
    a lazy person
    lie-abed, slugabed
    a person who stays in bed until a relatively late hour
    a worthless lazy fellow
    shirker, slacker
    a person who shirks his work or duty (especially one who tries to evade military service in wartime)
    slug, sluggard
    an idle slothful person
    a person without employment who makes money by various dubious schemes; goes about smartly dressed and having a good time
    someone who basks in the sunshine in order to get a suntan
    one who behaves lightly or not seriously
    someone who whittles (usually as an idle pastime)
    an idler who lives off of the work of other people
    lotus-eater, stargazer
    someone indifferent to the busy world
    dreamer, escapist, wishful thinker
    a person who escapes into a world of fantasy
    a soldier who performs his duties without proper care or effort
    lingerer, loiterer
    someone who lingers aimlessly in or about a place
    malingerer, shammer, skulker
    someone shirking their duty by feigning illness or incapacity
    plodder, slowcoach, slowpoke, stick-in-the-mud
    someone who moves slowly
    potterer, putterer
    a person who putters about
    a shirker
    straggler, strayer
    someone who strays or falls behind
    type of:
    a person who does nothing
  3. noun
    a person who is deemed to be despicable or contemptible
    “throw the bum out”
    synonyms: crumb, dirty dog, git, lowlife, puke, rat, rotter, skunk, so-and-so, stinker, stinkpot
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    type of:
    disagreeable person, unpleasant person
    a person who is not pleasant or agreeable
  4. verb
    be lazy or idle
    “Her son is just bumming around all day”
    synonyms: bum about, bum around, frig around, loaf, loll, loll around, lounge about, lounge around, waste one's time
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    type of:
    idle, laze, slug, stagnate
    be idle; exist in a changeless situation
  5. verb
    ask for and get free; be a parasite
    synonyms: cadge, grub, mooch, sponge
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    live off somebody's generosity
    type of:
    come into possession of
  6. adjective
    of very poor quality; flimsy
    synonyms: cheap, cheesy, chintzy, crummy, punk, sleazy, tinny
    of low or inferior quality
  7. noun
    the fleshy part of the human body that you sit on
    synonyms: ass, backside, behind, bottom, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush
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    type of:
    body part
    any part of an organism such as an organ or extremity
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