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1. The best, highest, or coolest; see biffdiff. 2. Used to convey a compliment of the highest order.
I woke up this morning, and I found a million dollars! Then I was given a life-time supply of beef ramen! This is the biffest day ever!
by Biff December 22, 2004
by Biff December 21, 2003
by biff March 22, 2003
by Biff November 08, 2004