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