Top definition
An obnoxious frat boy who hangs out with the boys way too much. Combination of "frat" and "fanatic".
Frat Guy 1: Dude, Johnson is a total fratnatic. He needs to

meet some ladies.

Frat Guy 2: Agreed. He's been having a little too much bro

by Kamikaze Kool-Aid Man September 30, 2010
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