Tet is a word used most commonly in spanish speaking countries, but can be used in english too. A tet is a person that has some similarities with dork and with wussie, and also has some of the caracteristics of a geek . A tet is a person that has such a social neediness, and is so insecure, and they usually are the guys that think they love someone and do everything for them, becoming such needy losers. Tets are also people that have physical clumsyness, etc, it can be seen from a lot of perspectives. Tets usually don't dress nice, they were pants too tight from the bottom and wear them above the waist, and they like to wear sweaters or jackets all the time, oh and of course many of them like to wear XXL football jerseys that make them look silly. Some tets are seen as weirdos too.
It is also used for bothering people about things they do, even though this does not mean being a tet.
I was talking to him and noticed he just wears XXL football jerseys and talks about foolish stuff. He's such a tet!!
Don't dance around like that please. You look like such a fucking tet.