Top Definition
When someone tries to hard to be a guy when it should come naturally.

Symptoms include overenthusiasm over bacon, bragging about the time you fucked a fat chick, kitchen/sammich comments, starting off statements with "your not a real guy until...."
Guy: Bacon! Bacon! Gotta have me some bacon!

Girl: Was there some bacon famine recently? Why are guys jumping all over this all at once now? You have Guyitis so bad you probably jerk off to Entourage.
by havalina June 29, 2011

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