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A terrible disease that typically effects only-children, but can occasionally strike people with siblings. It may also effect children whose parents divorce.
Symptoms include: playing mind games with members of the opposite sex, a cripling desire for instant gratification, the inability to compromise or share, and a total disregard for anyones thoughts or feelings but their own.
Example 1: Man, that girl is such a bitch- she wouldn't even spare a square! She has the worst case of only child syndrome I've ever seen!

Example 2: My boss has the worst case of only child syndrome ever! Every time I do something good he finds a way to slam me down just so he can feel better about himself.
by Andy Locoweed March 02, 2006
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The self-centered attitude and actions that a large percentage of people with no siblings make their calling card.
Lars: "Why does he think everyone needs to worship the ground he walks on?"
Marv: "Dude it's just only child syndrome."
by Albiesaurus Rex October 25, 2008
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Only children sometimes exhibit characteristics resembling women who have their periods. This can occasionally lead to flashes of intense anger when they don't get their way or someone insults them even the slightest bit. Also, when there is dissent in the friendship ranks which they are a part of, they lash out and try to make the other friends seem more culpable and especially more gay than they are. They have an overwhelming feeling that the world is against them and they tend to ruminate a lot as well. When you factor girls into the picture with an only child, it is never a pretty sight.
Garzon (on cell): Yo man, you wanna go play ball today?
Dre: Nah man, I got work today sorry
Garzon: God Damnit, no-one ever wants to fucking do anything in this town, i hate everyone. *click*

Later that night, Garzon ruminates for hours on how Dre is such a dick.

Garzon has exhibited traits that relate back to his "only child syndrome"
by darius jones March 18, 2009
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An incurable disease where the victim, after spending their childhood and adolescence in the endless days wallowing lonliness that comes along with being an only child, will prey on the opposite sex to fill the open role of an older or younger brother or sister in their life. this may be considered to be even sicker than a girl with daddy issues.

this often times only occours to children of white collar, yuppie, work-a-holic parents who tend to spend every waking moment neglecting their child for either work, buisness trips, or vacations with their husband/wife.

in almost every case of only child syndrome, the one kid was either a mistake or the opposite sex of what the parent was hoping for.
"jen is such a gold digger she only goes for rich older guys!"
"no, she just has only child syndrome, shes looking for someone to fill the role of an older brother!"
"ooh."

due to my only child syndrome, i was only friends with older girls in middle/high school, because i didnt have an older sister!
by giinny July 15, 2010
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Only-Child-Syndrome
a teenager or young adult that still acts like a self-centered little bitchbaby because they were coddled by their parents for their entire lives. These motherfuckers will get mad if you forget their birthday, or miss even the smallest of parties or events. They will likely have close relationships with their neighbors to make up for the lack of siblings. They think that they are entitled to everything and are spoiled rotten by their parents and grandparents. You will likely find them complaining or more commonly whining. They are so sheltered, they likely have little knowledge on any adult-topics and an even greater lack of social skills. Do not get involved with an only child.
(sarcasm) "I'd like to thank u all for coming it means so much to me 2 have all of ur support! Love u guys!"(end sarcasm)

why did she think we'd show up? she told us about this literally an hour before it started!

because she thinks the world revolves around her- it's Only Child Syndrome
by aud38 October 18, 2016
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Most commonly affects teenage guys. Only Child Syndrome is a terrifying disease to those who approach the infected. It most commonly infects only children, but in some rare cases people with siblings have been known to have the disease. Symptoms are selfishness, inability to comprehend other people’s feelings, and overall brat-like behaviour. If rejected in any way, for example, a breakup, those who are affected by Only Child Syndrome will most likely isolate themselves in an attempt for attention. Do not, under any condition, pander to these pathetic cries for attention. It’s all for a bit of drama.
Person 1: Mate, Alex told me that I would let him have my phone if I truly loved him!! How lame is that?

Person 2: Ignore him, it’s Only Child Syndrome.
by The better Anonymous January 17, 2018
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Most commonly affects teenage guys. Only Child Syndrome is a terrifying disease to those who approach the infected. It most commonly infects only children, but in some rare cases people with siblings have been known to have the disease. Symptoms are selfishness, inability to comprehend other people’s feelings, and overall brat-like behaviour. If rejected in any way, for example, a breakup, those who are affected by Only Child Syndrome will most likely isolate themselves in an attempt for attention. Do not, under any condition, pander to these pathetic cries for attention. It’s all for a bit of drama.
Person 1: Mate, Alex told me that I would let him have my phone if I truly loved him!! How lame is that?

Person 2: Ignore him, it’s Only Child Syndrome.
by The better Anonymous January 17, 2018
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