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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!"
tersh by duster2010 August 21, 2010
Related Words

Tershbern 

A measurement of some sorts.
Matt the bartender offed Daryn and John by means of martini, containing 1oz vermouth, 1oz tequila, 1 moldy orange peel, and a tershbern of arsenic.
Tershbern by Cleve-land October 19, 2018
Tre’shyah is a very nice person to be around. She is goofy she makes jokes that sometime can hurt someone but she is very pretty in many ways, some boys may be over her sometimes like 2 boys but her personality is amazing
“Is that Treshyah?”
Yeah that funny girl
“OH YEAHHH
Treshyah by Lashclay November 22, 2021

Tershawn 

A person who can take a hit for his friends and a person of his choice.Good at sports some times asshole and some times funny
Tershawn is a ass but a funny guy
Tershawn by Airliquid April 24, 2018
Q: When is that new game being released? A: I don't know, you should tersh it.
Tersh by Mamaknowsall July 2, 2020
There's tersha
Tersha by Tershysboyfriend August 7, 2023