Top definition
Not quite an erection, but getting there.
When I saw Milla Jovovich's boobies I got a semi.
by Germ March 15, 2003
Get a semi mug for your barber Beatrix.
Aug 10 Word of the Day
Running for exercise and picking up trash you find along the way. It's good for the body, mind, soul, and environment! Started in Sweden but is making its way to the U. S.
It's nice out and the city is filthy. Let's go plogging!
by Another damn hippie. May 09, 2018
Get a Plogging mug for your coworker Jovana.
2
A bitch, a barcode boi who spends all his money on Fortnite and doesn’t have a house and is poor he has a girlfriend named fian
You’re such a barcode boi. I looked at home and got a semi.
by Drugdealer12345678910 August 15, 2019
Get a Semi mug for your sister-in-law Riley.
3
the state of a penis which is not altogether flaccid nor erect. It will often occur at inopportune embarrasing times and will be brought on purposefully by a cunning sexy woman pretending she has no idea what she is doing.
"why are you still friends with some of your ex-boyfriends?"

"I like to keep them healthy and providing the regular semi keeps the circulatory system in check."
by MintyLeila June 18, 2005
Get a semi mug for your dog Beatrix.
4
the in-between state of a limp dick and a usable hard-on. can be on the way to hard, on the way back from hard, or never allowed to get more than 60% (+/-) hard.
many a young man learn to hide their semi with text books after day-dreaming in class
by the mac al February 28, 2006
Get the semi neck gaiter and mug.
5
A person who has a high tolerance, or can take numerous shots, blows, etc, but remains stoic or unfazed. The usual context is referring to a person in a fight or a person drinking numerous shots.
He's not even fazed. We got ourselves a full-blown semi.
by The Great Dark January 31, 2015
Get a semi mug for your Aunt Larisa.
6
1 -(n.) Any semi-automatic weapon; semi-shots, smg's, etc. (pronounced "seh-MEE")

2 -(n.) An 18-wheeler truck (pronounced "seh-MI")

1 - "Semi's are only half as fun as automatics."

2 - "Aparrently a semi loaded with cocaine and doritos rolled over on the freeway yesterday.
by Lil Dre March 19, 2006
Get a semi mug for your dog Trump.