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 7, 2009
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Going to my wife's work do, but can't get too drunk as my boss in-law will be there.
by Dave Newbold November 24, 2008
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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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