Top definition
The act of being a yahoo. Often personified accurately by Truman and his annoying camping tendencies--also could be a Jason camper--as well as his ridiculous classes.
Wow, that guy is yahooistic, yeah i know... Wait, Truman just joined our game on the other team.

Look at that bitch! He's being extremely yahooistic
by StShabock July 02, 2010
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