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1.
The third born child from a particular family. Usually used as a derogatory slur, the name "Third" implies that the individual is an accident or unwanted because of overpopulation.

The term originated from the book "Ender's Game". The setting takes place in the future and because of Earth's overpopulation, all families are only allowed a maximum of 2 children. However due to Earth's need for a super commander of all space forces, the Wiggin's are allowed to have a "third".
Child 1: Don't talk to him. He's a third.
Child 2: Yeah! Third! Third!
by Labadeeba March 12, 2008
 
2.
A nonalcoholic beverage consisting of roughly one third sprite, ginger ale, and coke or 1/2 sprite, and 1/4s of coke and ginger ale
Barboy, Beer-me one Third,
by radarhut December 18, 2010
 
3.
the same as shorts on cigarettes
hey let me get thirds on that square
by uhwhawt September 19, 2008
 
4.
Mixture of thoughts and words. See second definition of ord.
"Thirds!!!!"
by P-Diddler June 30, 2003