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!"
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