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8.
In the work place, it is a character assigned to someone that people give behind that person’s back. It is usually a comical, derogatory name or personality, weighing heavy on specific traits, such as a bad memory, meanness, or carelessness.

Crystal’s alter ego, Nina, has entered the room.
by Laurasia505 February 24, 2009
 
1.
Someone you're usually not.
My alter ego's name is "Hunky Dory", and he's a social kind of guy, meanwhile, I'm a shy person.
by SuperSonicX April 13, 2005
 
2.
The 'ghost' that you meet when you go to school.A character that comes out of your imagination,and is a criminal to your parents,because he or she took the family money that you were making when developing your hobbies and interests.
School may be boring,but your alter ego still gets to have fun!
by SomeoneNew June 16, 2011
 
3.
internet losers who must mask the fact that they don't have their own personality or social life. Most likely of canadian origin.
grimlock, RUSTEDSTUFF, america junior, bhat mann, winnie the trent reznor, space ghost, THE wade carlson
by cj June 10, 2004
 
4.
1) the opposite of who you usually are and your presonality (e.g. a hippie's alter ego would be a fascist dictator)
2. the bad side of a person that may come to life at anytime, switching your personality (this is fantasy, though some people may believe they have an alter-ego in which they can't control).
3) A person who you aren't ut you act as sometimes as though you have transformed (e.g Eminem's alter ego is Slim Shady)
My real name is Tim James. My alter ego is Aaron Lewis.
by Bastardized Bottomburp March 21, 2003
 
5.
The dramatic change of personality some people undergo after consuming ecxtasy or other narcotics. They have no recollection of taking on there embarrasing alter-E-go or anything they do when they've changed.
Friend 1: "no way is that Anton rolling around on the dancefloor naked?".
Friend 2: "no man that's Bernard his alter-E-go!".
by Wigan February 21, 2008
 
6.
m4d l337 n1nj0r
alterego totally pwned me. with a headshot. now i'm headless.
by alterego September 22, 2003
 
7.
1. someone you turn into when you become drunk.
1. On the Real World: Philly, Sarah and MJ's alter egos are Ivana, and Muja Star, respectively.
by Lina December 25, 2004