When a girl is having sex with a guy regularly but he is not or will not ever be her boyfriend yet she starts to act as if he is. Getting jealous, wondering where he is, who he is with. Starts to become sensitive to the things he says.
Julia: "Ugh Ryan hasn't text me at all today"

Stefani: "Julia it's only 10 am"

Julia: "Well he posted a snapchat so I know he is awake!"

Stefani: "OMG you have boyfriend syndrome"

Julia: "FML OMG I dooooo"
by EllaElla October 28, 2017
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When you have the attributes of a typical male in a relationship (but does not necessarily have to be in a relationship, nor applies to the lead role); you start to not care about what the other says or notice any changes in them, asking them to make you sandwiches, or too busy playing video games to notice them.

This is often witnessed in a relationship in which the couples are very comfortable with each other, have been together for months if not years, or a crumbling relationship, or a combination of the set above.

However, it can also apply to close friends or family with similar forms of ignorance and douche-baggery.
It doesn't mean they don't love you; it means they just don't care about you at the moment.

Jim: Hey, you didn't pick up last night. What were you doing?

Jill: Stop worrying, you pussy. I was painting my nails and playing your CoD file.

Jim: I told you not to touch my 360! Ever! Go make me a sandwich for that, bitch.

Jill: Well that sandwich won't fix itself until you fix the God Damn Bathroom.

-- Later --

Jill: God damn, Jill is giving me the "Boyfriend Syndrome".

Jack: What? Sorry, bro, I didn't catch watch you said. Is that chick was eyeing me over there?
by ninjastarburst May 23, 2010
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A disease that afflicts girls who acquire a boyfriend and ignore every other person in their lives except for their significant other. They spend every moment possible with this person, much to the annoyance of their friends.

A girl with OMG!Boyfriend usually doesn't notice she has the disease until said boyfriend breaks up with her two years later and she's left alone and friendless.
I was supposed to go to the mall with Sarah, but she bailed on me to hang out with Steve. She has a horrible case of OMG!Boyfriend Syndrome.
by PinkertonChr July 2, 2009
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A mental disorder typical in women who have a loser boyfriend.

The woman will be depressed because the loser will not take her anywhere and is completely incapable of doing anything positive for her.

She will constantly whine and complain to other men about how her loser boyfriend makes her miserable but NEVER does anything about it, even if a good man is standing right next to her.

They often find reasons why they can't leave the loser and 100% of the time it's a bullshit reason, they just love to be miserable.

Chances of a woman with this mental disorder pulling out of it is about 1 in 300,000,000,000.

This mental disorder is fatal for the woman afflicted and for any man who isn't a loser that gets involved with her.
EXAMPLE:

Friend: "Yo, Early ask that girl out man, she seems like she digs you."

Early: "Nah man, Jamie has LBFS, also known as loser boyfriend syndrome.
Shes addicted to a loser who can't do anything for her.
If I want a shot I'd have to be a complete loser.
You know, treat her like shit and be a complete drain on her finances, fuck that.
I have too much self respect, too much going on for me, for her to really want me."
by EarlyCuyler June 11, 2010
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whenn you have a boyfriend who is so damn jealous you aren't allowed to hug any other guys, talk to any other guys, look at any other guys, or even THINK about any other guys.
" I said hi to Brad today, and Tom totally flipped out. He's got a serious case of Jealous Boyfriend Syndrome.
by t3am0x33 April 25, 2005
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a guy who obviously has huge insecurity issues so he tries to control who you talk to, what you wear, what you talk about, etc. they really need to go talk to a therapist, but they're "too proud" to do that even to save their girlfriend all the misery he's putting her through.
See asshole and football player
"Hun I'm just gonna go over there and talk to my friend Kyle ok?"
"NO YOU FUCKING WON'T BITCH!!!! cuz i have jealous boyfriend syndrome and i'm too insecure so i take it all out on you cuz misery loves company"

"Hey baby :) do you like my new skirt?"
"no i don't you look like a fucking slut, you can't wear that around me"
by KDeneumo July 17, 2006
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