Definitionsbuttocks, the ass. See ass for synonyms.
Etymology: Usage dates back to the late 17 th century; in England it fell into disrespect around 1790.
Quotes: William Shakespeare:
-- In A Midsummer Night's Dream (1590) Puck: ' The wisest aunt, telling the saddest tale / Sometimes for three-foot stool mistaketh me / Then slip I from her bum, down topples she.'
-- In Measure for Measure : ' Your bum is the greatest thing about you.'
2. A hobo, a tramp.
3. An adjective synonymous with unjust, unfair.
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bully in the muzzle