Top Definition
An inflatable ring cushion for old people with bad joints or pathetic losers who crack, chip or bruise their tailbone/butt.
When Brigitte was sent careening down the snowy hill and smashed her tailbone into some rocks at the bottom, she eventually had to buy a butt donut to sit on for 6-8 weeks.
by kittens1236 December 12, 2009
Noun: A medical device used by people with a broken tailbone or hemorrhoids to sit.
Adjective: Acquiring a reputation for sleeping with numerous people of questionable sexual health.
Derivation: A subset of the phrase "getting more ass than a toilet seat".
That guy get's more broken ass than a buttdonut.
by E. Fletching August 22, 2006
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