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-ass

  1. a combining form of ass in the sense of ‘stupid person’ or ‘the buttocks’, used in slang words as an intensifier or with disparaging intent: big-ass; stupid-ass.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for bigass

adj.

also big-ass, big-assed, by 1945, U.S. military slang, from big + ass (2).

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Online Etymology Dictionary, © 2010 Douglas Harper