A male who doesn't have many or any male friends so he usually only has his girlfriend and/or her friends to tag along with.

Derived from the 2009 comedy, "I Love You, Man" starring Paul Rudd and Jason Segel.
Chris -"Dude, is Steve gay? cuz all I see him with is Loren and her friends."

John-"nah Loren's his chick. He's a Girlfriend Guy; no male crew at all."
by K-Da6'1 August 15, 2009
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A guy usually named Nathan who spends his Monday nights with his girlfriend instead of the boys
Kerst-Where’s Nathan for Monday shotguns?
Moe-no idea, ohhh wait he’s with his new girlfriend
Friend 3- oh he’s a girlfriend guy now
by Sweet4469 February 25, 2020
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The name given to girls that aren't popular but have boyfriends that are sort of known by everyone.
"Dude, who's that? I haven't seen her like... EVER. Where the hell did she come from?"
"I think that's That One Guy's Girlfriend, you know, the one that looks like Harry Potter? She's been in the same school as you since 3rd grade, man. Seven whole years."
"No fucking way... Huh..."
And they both continue on their way, only to forget about her.
by OzzySychophant September 20, 2009
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A male who spends a disproportionate amount of time with his female significant other, often at the cost of hanging out with the boys.
A: Has anybody seen Cooper this weekend?
B: I think he's back in Chicago again.
A: Man, what a Girlfriend Guy!
by leadrock December 4, 2022
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