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1.
Sem
Abbreviation of "awesem," a slang version of "awesome." used commonly on student film sets in the Chicago area to refer to something extremely cool or pleasing.
- "hey, the car mount is ready."
- "SEM."
Por SylviaToo 23 de enero de 2010
 
2.
SEM
Sexually Enhanced Males
"Did you see that guy over there?"
"OMG yesssss, must have been a SEM"
Por urbandictionaryperson123456789 23 de octubre de 2011
 
3.
Sem
The greatest person in the history of the universe, everyone who meets him wants to be him or be with him.
Man I wish I was Sem!
Por Erin Maxwell 27 de mayo de 2011
 
4.
SEM
SEM: Self-centered Egoistic Maniac

A person who has the highest opinion for himself/herself that is very annoying.

Someone who is obsessed with himself.
Person #1: Look at her. She is obsessed with herself.
Person #2: She is such a SEM.
Por Jana-Blonde 29 de junio de 2009
 
5.
SeM
Sem: Semen Eating Monster
A ugly, fat, skanky, female. Most likely has some sort STD, like crabs or scabies. Likes to fuck anything with a penis. An outcast.
a) That bitch is such a SeM, its discusting.
b) Fuck that SeM and her skanky ass.
Por kjdfhgfhdf 07 de marzo de 2007
 
6.
sem
(n) Ebonics for the number seven.
"I keep it crunk twenny fo'-sem!"
Por Lil Dre 21 de marzo de 2006