1. The extra amount of money spent just by having a girlfriend.
[ Origin: I have no idea. I'm thinking Marloue though ]
1. "How come Liang didn't want to come to lunch with us?"
"He's been trying to cut down on costs."
"Oh, that's right. He's got that trip to NY, and then that trip to Miami next month."
"Yeah. Girlfriend tax is hitting him hard."
2. "You know I'd kick in on the keg bro, but February is the worst month for GF tax and I'm tapped"