and work (one's) ass off; work (one's) buns off; work (one's) butt off
tv. to work very hard. (Often objectionable.) : You spend half your life working your butt off—and for what? , I worked my buns off to get this done on time!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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