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Sebastian 

A male with disgustingly crusty hair who believes he is part of a Native American tribe; also aspires to be in the Military despite being in horrible shape, lacks any social status, and while most likely remain a virgin the rest of his life.
Eeeewwww Sebastian touched me my hair could have lice now.
Sebastian by Taz819 March 1, 2018

sebastian 

a guy who made you fall in love with him quickly . very attractive. turns out to be a fucking asshole who’s abusive and doesn’t let you see or talk to any other friends. you can only spend time with him and if you don’t follow all of his rules there will be consequences. oh yeah also if you break up with him eventually he will threaten you. asshole abusive boyfriend bye
girl: woah he’s such an asshole!
me: are you dating a sebastian?

girl: yeah i guess so!

me: rUn WhiLe YoU cAn..!!!!!

Sebastian 

A male name, resembling disturbing and impulsive filth.
You probably don't want to go for that guy, his name is Sebastian.
Sebastian by TheCommissoner October 2, 2016

Sebastian 

The type of guy that will cheat on you multiple times and blame you when you find out.
Typical Sebastian calling girls over the night his girlfriend goes on a trip
Sebastian by Nelly Gettin September 26, 2017

Sebastian 

A typical asshole, many would say obnoxious. He isn't a kind-hearted babe but in fact a complete dickwad. You'd think that he would be the sexiest dude ever but in reality, sebastians are a very rare breed. they come in only one pack of themselves and each and every one is unique. some are downright dastardly and some are cool.
but for the most part their assholes.
"dude, that guy is a total asshole"
"I guarantee you his name is Sebastian"

Sebastian 

Sebastian is super smart dude that wants to go to MIT but is a complete duchebag and has big gae. He is just a bitch ass punk like his friends. He also makes his teachers fall in love with him and sucks at wrestling.
That guy is gay, he has to be a sebastian
Sebastian by gay bo1 June 5, 2018