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A name givin to a male who is a failure with the opposite sex.They can't carry on a conversation with a female for more than a few secounds without the girl walking away in disgust/fear or slapping the guy in the face. Typically they have a odd fashion sense and where shirts with "funny" sayings on them that are just plain uncool. The guy will say the most ungodly awful things to the girl. They typically go for girls way out of there leauge and they almost always don't know there is anything wrong with there behavior till a friend tells them.
A example of a theseth saying a werid thing

a theseth: Hi how are you?
girl: Not too good, I got a bad sunburn
a theseth: Sunburns are not so bad there fun to pick at.

(girl walks away)
theseth by Dannyd315 December 2, 2007
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The Seth Rogen Gene

A gene that when injected into your bloodstream gives you the appearance of being funny even though you've said nothing funny
You: So what's this one?
Doctor: The Seth Rogen gene, it gives you the appearance of being funny even though you've said nothing funny.
You: Oh... Hey doc are we done here? I gotta grab some beers with the fellas.
Doctor: HAHAHA! THAT IS HILARIOUS!
The Seth Rogen Gene by BigJ91 September 29, 2011
the best band to come out of anywhere, ever
dude, have you heard theset's new song? THEY ARE SO AMAZING
theset by someone incredibly awesome February 28, 2005

Revenge of the Seth

This is actually what Seth's coworkers experience after he has been to El Fenix for lunch.
After having the enchilada special and copious amounts of chips and salsa, Seth returned to work and unleashed the Revenge of the Seth upon his unprepared coworkers.
Revenge of the Seth by Rinse May 14, 2005

The Seth Rogen 

1) When you're pretty high and you can't keep your gut in

2) feeling bloated after eating a dope ass snack
1) Dude I'm so high, im doin The Seth Rogen
2) I feel like Seth Rogen bro

Therethenfourth

To proceed with Stagger for there is something a mist
Therethenfourth your boutoxe is to sit on behemoths rock ( just so u know the u should tread lightly in this situation because I am not talking about the person who made this email for I am a behemoth of many an you shall get half of the product you receive for blamin me in the way of bitch πŸ–•πŸΌπŸ™πŸ½)
Therethenfourth by Nippi kay June 19, 2021

Theesthan 

Theesthan is cool 🀣
Theesthan by EkoNotPro June 25, 2022