bum

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The buttocks.
• noun A tramp; a vagrant.
• noun A lazy or shiftless person, especially one who seeks to live solely by the support of others.
• noun An incompetent, insignificant, or obnoxious person.
• noun One who spends a lot of time doing a particular recreational activity.
• intransitive verb To live by begging and scavenging from place to place. Often used with around.
• intransitive verb To pass time idly; loaf. Often used with around.
• intransitive verb To acquire by begging; cadge. synonym: cadge.
• intransitive verb Slang To depress, dishearten, or dismay. Often used with out.
• adjective Inferior; worthless.
• adjective Disabled; malfunctioning.
• adjective Unfavorable or unfair.
• adjective Unpleasant; lousy.
• idiom (on the bum) Living as a vagrant or tramp.
• idiom (on the bum) Out of order; broken.

from The Century Dictionary.

• To make a hollow noise; boom; hum; buzz.
• To rush with a murmuring sound.
• 3. To guzzle; drink.
• To sponge on others for a living; lead an idle or dissolute life.
• To dun.
• To spin (a top).
• To strike; beat.
• noun The buttocks; the part of the body on which one sits.
• noun An imitative word expressive of a droning or humming sound, as that made by the bee; a hum.
• noun A drink.
• noun A drunken loafer; one who leads an idle, dissolute life; a bummer.
• noun 4. A drunken spree; a debauch.
• noun Hence A convivial meeting.
• Of poor quality; low-down: as, a bum show; a bum performance.
• noun A bumbailiff; the follower or assistant of a bailiff.

from the GNU version of the Collaborative International Dictionary of English.

• noun A humming noise.
• intransitive verb To make murmuring or humming sound.
• intransitive verb to wander about idly or aimlessly.
• noun Low The buttock.
• transitive verb informal To borrow without intention of returning; to cadge; ; -- usually with inexpensive items as the object.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb to depress; to make unhappy
• noun dated A humming noise.
• noun The buttocks
• noun UK, Ireland, Australia, New Zealand, informal (rare, Canada, US) The anus
• noun informal A person
• verb UK, transitive, colloquial to sodomize; to engage in anal sex
• noun North America, colloquial A hobo; a homeless person, usually a man
• noun North America, Australia, colloquial A lazy, incompetent, or annoying person, usually a man
• noun North America, Australia, colloquial, sports A player, usually a man, who often or usually plays poorly
• noun colloquial A drinking spree.
• verb transitive, colloquial To ask someone to give one (something) for free; to beg for something
• verb intransitive, colloquial To behave like a hobo or vagabond; to loiter
• verb transitive, slang, UK To wet the end of a marijuana cigarette (spliff)
• adjective Of poor quality or highly undesirable.