Top Definition
A baseball-like game consisting of two teams, a whiffle ball, aluminum bat, 5 bases, and David's backyard. The fourth base, also known as the quad, is very close to third base and the left field foul line, making it very easy to steal. However, pegging is both legal and encouraged, so don't get your hopes up. The only current PentagonBall field is in Wilmette, Il, and the home field of the East Side Thugs.
Leland: PentagonBall tournament on Sat... you in?
Alex: OHHH YEAAA. I cant wait to get a Penta-Slam!
by Not a triangle April 02, 2009

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