Bitch tax is what you pay after breaking up with someone. It refers to the value of whatever personal effects of yours they had and now will not return.
John: She has my favorite shirt, three of my CDs, and my dog, and she's refusing to give them back now that we've broken up.
Adam: That's a tough bitch tax to pay, man.

Sally: I left my shampoo, makeup, and underwear at his place. Should I call him to try to get it back?
Jane: Just pay the bitch tax and move on.

Tom: Amanda stopped by to return my apartment key, autographed baseball, and the $30 she owed me.
Kristen: Wow, you didn't have to pay any bitch tax? Nice breakup!
by outofspite September 27, 2013
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1. The price you pay for having a girlfriend or wife. It could be money or something more abstract such as loss of your freedom.

2. Alimony and/or child support.
You, remembering the good old days: "I used to be flush with cash until I started paying the bitch tax"

Coworker to you: "Hey man you wanna grab a beer after work?"
You: "I'd love to but I can't afford the bitch tax".
by TenInchTim September 21, 2007
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The fee you are morally entitled to charge your female friend when on any occasion or outing, they start to bitch and complain.
'We went on a girls weekend away and it only took 5 minutes for Sandy to start bitching so we had to increase the Bitch Tax.'
by jimsweirdnakedindianfriend November 29, 2009
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