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When you begin to fail a class or classes because you are too preoccupied nailing your girlfriend. Most would consider this a good trade.
Petus: "hey, did you hear that (insert name here) is failing spanish?"

Tony: "It's because he's too busy with his gf. This is all a very standard Fail-Nail trade off."
by Psas May 05, 2009

Words related to Fail-Nail trade off

bang fail nail screw trade