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!

by Erin Maxwell October 14, 2011

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."

by SylviaToo January 23, 2010

SEM

Sexually Enhanced Males

"Did you see that guy over there?"
"OMG yesssss, must have been a SEM"

by urbandictionaryperson123456789 October 23, 2011

Sem

used instead of "same".

"I eat pizza last night."
- "sem, me too."

by weeb-attorney January 19, 2021

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.

by Jana-Blonde June 29, 2009

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.

by kjdfhgfhdf March 9, 2007

Sem

Fucking a girl from both side and giving her a cream pie on all hole sides(mouth,pussy,and asshole)

Dude I sem this chick the hell out her last night....it was lit!!

by Don’t waste time nigga April 20, 2018