First Girlfriend 

A lot of guys do pussy/stupid shit when they're whipped on their first ever girlfriend. This is the excuse they can use when their buddies rag on them for it.

Example A)

Guy 1: Remember when you went to Stacey's house in the middle of the night to hang out with her, but she was asleep, and you waited outside til morning? That was some creepy shit, dude!

Guy 2: Yeah...First Girlfriend though.

Guy 1: True, I guess it's ok then.

Example B)

Guy 3: Didn't you tell Bec you loved her after 1 day?

Guy 4: Yeah, but First Girlfriend.

Guy 3: Fair enough.

First Girlfriend by Ddizzz August 8, 2010

First girlfriend syndrome 

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"

First girlfriend syndrome by kvn23 April 21, 2010

First Girlfriend Confidence Boost 

First girlfriend confidence boost or FGCB is a condition that occurs when someone who is socially awkward and has no history with women finally gets a girlfriend. They person will begin to think they are cool, even if there girlfriend is unattractive and they will think they are "the man" because their penis gets touched for the first time, failing to realize that everyone's has by now. They may try to act like a tough guy because they are taller than their girlfriend when in reality she is most likely just really short. The only cure for FGCB is a breakup which will destroy this newly found ego.

Jake kept talking about how much action he's getting, then tried to fight me, I think he's got a case of the First Girlfriend Confidence Boost.

First Girlfriend Confidence Boost by The Hershey Factory October 23, 2012

Firstgirlfriendisitis 

1) A condition in which a person is so overcome with lust and affection for their first girlfriend that they tend to act in an irrational manner, and adopt the belief that relationships are all "gumdrops and rainbows in perfectland."

2) An advanced state of being lovesick for one's girlfriend.

The person is almost guaranteed to suffer temporary depression, threaten to attempt suicide, become pussy whipped, abandon pre-existing friends, cancel prior plans so he/she can "spend more time" with their girlfriend, spend massive amounts of unnecessary money on dinner/movies/flowers/her bills/candy/etc, or all of the above.

Guy 1: "Dude, where the hell has Frank been!? I haven't seen him in over a month!"

Guy 2: "He's got a bad case of firstgirlfriendisitis, man. He started dating Suzie, and he ended up spending the money he was saving for college on her!"

Firstgirlfriendisitis by BombaRed April 9, 2009