When after getting a girlfriend every woman other than her becomes not as hot. This makes your girlfriend look much more beautiful and sexy to you because she's your girlfriend. Much self-esteem is lost after a breakup with the girl and your friends will pester you for ever going out with her.
Tom: Man Jim thinks his girlfriend is the hottest girl on the earth!

Joe: Yeah, he's come down with a bad case of Girlfriend Syndrome.

Tom: I know the chick he's dating isn't even hot!
by omgwtfbananas December 27, 2010
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A condition in which a friendzoned guy begins to treat one of his female friends as a girlfriend, by being overbearing and overprotective around her
Jon: Hey, do you know why Bill was so mad at me when I told him I was spending time with our mutual friend Alice?
Phil: No idea... sounds like an imaginary girlfriend syndrome though!
by protomorphius January 17, 2012
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when a guy loses all contact with his friends to spend time with his first girlfriend, which will inevitably end with him dumped and without friends
"hey man when was the last time you saw tom?"

"months ago, he has really bad first girlfriend syndrome"
by kvn23 April 21, 2010
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When a guy has a girlfriend that he thinks/knows cheats on him, so he's mistrustful of everything and everyone with a dick he comes in contact with. Charachterized by low ego, short temper and mistrustfulness.
Guy 1:"dude, what happened to dominic? We were, like, tight until he got mad cuz his girl looked at me for half a second. He like, wanted to fight me and i didnt say shit to her..."
Guy 2:"he's got Promiscuous girlfriend syndrome bro. She fucked, like, half the dorm."
by LilCaptianKirk August 4, 2019
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Long story short, when an insecure girl overreacts and gets extremely jealous because her man is talking to another girl, even if just casual. The girl suffering from Jealous Girlfriend Syndrome usually does not have a whole lot of trust in her man, otherwise she wouldn't overreact so much. In some cases, a girl suffering from Jealous Girlfriend Syndrome (JGS) will freak out if another girl even looks in the general direction of her man.
Susie: "Yeah, I got on Myspace this morning and had a message from Tina who was freaking out because I exchanged comments with her boyfriend."

Chadwick: "Eh, she's just suffering from a bad case of Jealous Girlfriend Syndrome."
by Kaptain Kangeroo May 3, 2009
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Being needy with someone you are not romantically involved with. Using phrases such as 'why haven't you called back', 'I left a message, did you get it', and the ever so famous 'Did I do something wrong' when the person is just flat out too busy to get back to you.
I sent you an email yesterday and called today, did you not get them? I need to talk to you, are you busy? Are you mad at me? I am starting to develop Needy Girlfriend Syndrome over here!
by finsjm March 22, 2009
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When a female or male gets female or male partner and hangs out with them so much that everytime a friend calls there always doing something with their partner and never have time for you. Their partner is included in all their plans and are they are rarely ever away from them. On those very rare times they are away all the do is talk about their partner and even leave early to go see their partner.
You: Hey whats your plans for the night? i felt like i havent seen you in a long time!
your friend: Well i have a movie date then were just going to back to the house. we should meet up another time! ill talk to (their partner) and we will arrange something
You: okay talk to you later ( you not sounding surprised at all ,uttering the words boyfriend girlfriend syndrome)
by tinsi June 21, 2009
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