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A euphemism for "to tear someone a new asshole" — that is, to come down on someone very harshly as a punishment
Okay, okay... no need to tear a spare.


Before: Don't forget to take the trash out, or I'll tear you a spare.

After: Jeez, I forget to take the trash out one time and you tear me a spare...?
by Zoboomafoobar March 15, 2008
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