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1.
When one does or gets 5 great, and sometimes sneaky, things all within a short timeframe. An extremely rare event, surpassing both the Trifecta and Fourfecta. It's usually very risky to go for the Fivefecta.
Even though she knew she was taking a big chance, Mable could not resit the lure of the Fivefecta.

Mable: I'm putting everything on black 13.

John: But Mable, you already won 4 times in a row. Why risk it now?

Mable: I don't care. I'm going for the Fivefecta.
by mike 3k gold July 24, 2005
 
2.
When one does or gets 5 great, and sometimes sneaky, things all within a short timeframe. Better than a Fourfecta. Not as good as a Sixfecta.

Joe: So did you go out with that girl last night?

Bill: Yup, im going for the fivefecta.

Joe: You mean the whole drill squad?
by poil11 August 22, 2006