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When someone works for the significant other of a friend.
Bill - Hey, I hear your boss is my new girlfriend.

Gabe - Yah, I guess so.

Bill - So, I guess that makes me your boss-in-law.
by Werrick April 07, 2009
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3
Your boss' boss.
My boss-in-law called me to get office to see if I would be get inside spy on my boss.
by Ugly IT Chick August 29, 2014
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