Top Definition
N (1) : Cocktail, consisting of one pint of Guinness with a shot of Kahlua or Tia Maria and a half a dozen M&Ms or Smarties. do not stir.

N (2) : Anal Intercourse Party or frenzy.
(1) Would you like to come back to Jim's house for a Backdoor Bonanza?

(2) Would you like to come back to Jim's house for a Backdoor Bonanza?
by Tones the Knowledgeable November 17, 2003

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