fag the scam

Similar to "queer the deal;" to somehow cock up a flawless plan with stupidity and/or incompetence.

I was all set to take that girl home last night, but her fat friend managed to fag the scam.

Ross had everything lined up to buy a house, but the bank found out he was broke and fagged the scam.

by Hank Bennet October 6, 2009