An ingrained fear reaction that younger siblings show towards an elder. If properly nurtured can result in reactions such as flinching when the older sibling walks past even though the younger is taller, bigger and stronger and 18+. This can also result in a defeatist attitude and outcome when in confrontations with the older sibling.
Luke was a victim of little brother syndrome. Even though he was bigger, stronger, faster and a black belt in karate he could never defeat his older brother in a tickle fight. Luke is 20 years old.
by Rincow April 15, 2011
When an older sibling brings a best friend into their home and the littler sibling thinks said person is their new friend and tries to impress them/flirt/or just won't leave you too alone for any reason
Your little brother has "Little Brother Syndrome" when he keeps trying to show your best friend his vast collection of Hot Wheels, even though said friend doesn't care and you both want him to go away.
by Dr. Upin Disbich July 05, 2015
by Harligan December 08, 2019
The inverse of paranoia about the governing power or establishment collecting information about an individual. (See Big Brother) Those afflicted by little brother syndrome intentionally share and broadcast information about themselves via social networks, check-in websites, and GPS devices, often with little regard to personal privacy, or long-term consequences. Possibly a form of exhibitionism, this definition of Little Brother Syndrome may be related to, or even a consequence of another definition of Little Brother Syndrome wherein a person vies for attention to make up for feeling under-appreciated.
Grover apparently doesn't care who knows all about him, as he posted his home address, salary, and cell phone number to Twitter, Facebook, MySpace, and Wikipedia today. He's definitely suffering from Little Brother Syndrome
by Mighuel October 22, 2010
When one person feels they have a rivalry with another far superior person. The superior person usually doesn't know about it or feel that the little brother is any kind of a threat. The little brother usually puts forth maximum effort in meaningless situations in order to get the feeling of a win over his rival.
by persephone81 August 13, 2009
When a person(doesn't always have to be a sibling) idolizes something you have done and decides to follow in your footsteps, ultimately copying exactly what you have done; complete and juvenile lack of originality.
My friend has little brother syndrome. I began to pursue my dream of writing comic books, and not to my surprise, i find the hack doing exactly the same.
by xX Unwise Xx January 13, 2010
Following around friends like a clingy younger brother. One with said syndrome cannot make decisions for or take actions by himself. Usually acts like a fake-ass punk and/or lil bitch.
I walked into the other room and he followed me. So I went back into the livingroom and, sure enough, he came in a minute later. Fool wouldn't even go to that girl's house by himself. He's got a bad case of little brother syndrome.
by Not your brother! April 09, 2009