1. Derfcake is the definition given to a birthday cake with 'derf' qualities. Sometime during one's life, they recieve a cake which doesn't quite become the hit that is once thought by the purchaser.

2. Derfcake can also be used in replacement of 'derf', meaning retard.
1. "That's not a cake, it's a derfcake!"

2. "Bob Saget is a smelly derfcake!"
by MetNightingale June 5, 2007
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