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1.
When a guy is slightly sexist, or biased, against women.
Jenny, "You're so sexist."
Mitch, " I'm only guyist for the superior gender, men."
by SuperSquare February 03, 2011
 
2.
An every man, a guys guy, a guy who knows things guys like.
Guy 1: That guy knows all the cool stuff.
Guy 2: Yeah, he's a guyist.
by Chucky Cee June 26, 2013