Halfway between Hard and floppy, often what men with small penises get when they shower with other men to cover up the fact that its tiny
Bloke 1: Man that dudes got a big slong!
Bloke2:Nah its probably just a semi!
by Moby January 27, 2004
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The dick measurement threshold that happens between the semi->rock hard phase. Often misconstrued as simply a "semi" or a "hard-on" to the untrained eye, a semi+ is the result of an innate emotional response that occurs involuntarily.
Jesus fuck, boys... that fat, ratchet bitch has me all sorts of worked up. Not gonna lie, I've got a semi+ popping out my knickers. I'll catch up with you in a sec.
by msacco May 18, 2022
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Semi is a sweet, strong and energetic person. Who is kind and nice to everyone. He has a special way to make your day brighter. A strong, powerful man. So funny and nice. A fun person to be around. He also known of being weird.
Semi is sooo weird lol !
by Boyyest1534 July 19, 2019
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Semi's is semi losers... Like semi's and full blown
Now we cross the line from semi's to full blown

I hate those fuckin semi's

by Allan S November 21, 2005
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To exchange live audio/video feed or pictures via the internet with another person. Sometimes while partially naked.
Me and Tommy semi'd online the other day.

I was semi'ing again with Rachel on Friday.

I semi'd you the pics the other day, man.
by iSemi December 23, 2008
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The final word in all things pimp.
Semi On slapped her ass, bent her over backwards and kissed her navel.
by ArsHole August 22, 2003
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