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only child 

a person who has no brothers or sisters.

has its pro's and con's, you usually can mamange to get whatever you want, you don't have to deal with any annoying little brats or other siblings who irk you, but most of the time, it's lonely.
jenny has no brothers or sisters, she's an only child.
only child by i wanna be a kennedy October 23, 2005

only child 

Someone who has no siblings. Some upsides are getting what you want, having some friends that are only children, no being irked, and having higher goals. Downsides are lashing anger on kids who have siblings, and can end up being a jerk. Sometimes it leads to having an inflated ego.
Friend 1: How's your sister?
Friend 2: Pretty good. She's playing soccer.
Only child: I'm frickin' tired about my brother that, and my sister this! Screw all of you! *walks away*
Friend 1: God, what a jerk.
Friend 2: I know.
only child by yahmoo23 April 15, 2010

only child 

the Only Child is a clever species which mimics the Regular Human. Indistinguishable by simply looking at them, you must get to know an Only Child to know that they are, in fact, an Only Child. As a species they tend to appreciate being alone more so than the Regular Human, and more often like quiet thinking time and don't mind hanging out by themselves. At a young age, all Only Children tend to go through an elongated "brattiness" phase, which tends to be more extreme than that of a Regular Human child. Depending on the parents, the Only Child may eventually grow out of this phase, and surrounded by Regular Human friends, can blend in perfectly. The Only Child has been observed to experience loneliness quite often, and usually feels that this loneliness can be filled best by a relationship, and extreme cases the longing for a relationship can be more important than maintaining the type of friendship observed in the species "Regular Human". However, it is indeed common for an Only Child to fall harder and faster when it comes to relationships, and tend to experience emotions more intensely. If an Only Child has trouble finding an acceptable relationship, they may become uncomfortably hormonal. For example, it is possible that a female only child could even have as many hormones as a 17-year-old male. Which is a fuckton load. Only Children also love Pokemon, especially Wooper.
1. Bro 1: If I ever have kids, I'm def gonna have more than one. I don't want to have to raise a bratty, over-hormonal only child.

2. She must have gotten through her annoying only child phase, because we've been friends for years and I just assumed she had siblings.

3. Duder 1: Man, that bitch is such an only child. When I asked her to fuck she got all emotional and now she's telling people we're dating. WTAF.
only child by ilovethesilverfox January 2, 2012

Only child 

The lonely bitch out here
Are you an only child?
Yes!
You must be lonely as hell
Only child by Frostykid April 10, 2020

Typical only child 

A person who was an only child growing up. They are typically very independent, hard working, and dedicated. But they must get there way, otherwise a temper tantrum will be had.
Alex works 60 hours a week. Alex has never missed a day of work. Alex didn't get what she wanted for lunch today and she started crying. Alex is a typical only child.
Typical only child by Autopartsfreak September 9, 2011

only child timeframe 

A term that describes the distortion that occurs when someone who’s an only child who grew up regularly distorting or misperceiving time intervals ballparks how long something is going to take.
When she gives me one of her only child timeframe estimates, I just double it so I don’t lose my mind.