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3.
A person on the outskirts of a group; a non-entity who doesn't matter. Short for tertiary.
I can't believe that tersh just had the nerve to look at me.

Forget about Alex, she's so tersh.
by MeredithO May 28, 2006
 
1.
A person in a large group, such as high school or summer camp for example, who is so unpopular and unnoticed and does so little that many people do not even know who he/she is. Originally short form of tertiary, where primary is used to describe the most popular or well-known in the group, and secondary people are average and known by a few people in the group.
person 1: "hey, you know that guy Jonny York? He's such a tersh"
person 2: "Who the hell is Jonny York?"
person 1: "Exactly!"
by duster2010 August 21, 2010
 
2.
A person on the outskirts of a group; a non-entity who doesn't matter. Short for tertiary.
I can't believe that tersh just had the nerve to look at me.

Forget about Alex, she's so tersh.
by MxO May 23, 2006