A half boner, or semi-erection where the penis is not yet completely erect, but not completely flacid.
Dude, that super hot chick gave me a hug and before I had any idea I was sporting a mean sem-dog.
Can I get a sem-dog for my Rem-Dog. (Said when you want your friend Remy to get some ass).
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A person who egg. SUS SHIT BOYS WHO LIKES EGG JUICE.
Sus Sem is a fucking egg
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A person who won't admit to being salty or angry at every situation. Possibly plays Mario in Smash Bros.
Dan: What was with that guy's outburst at the bar earlier today?
George: I'm not sure, but it seems to be he was being a salty sem.
a superior term for socratic seminar
Person 1: What are we doing in class today?
Person 2: I think it's time for a soccy sem!
A Wife, Fiancรฉ, or Serious Girlfriend of a U.S. Marine.
A Female Most men find Stunning, Usually a Woman who can have any guy she wants, but remains Completely faithful to her significant other/Spouse while He's away in the Marines Corps.
Guy 1: Damn, Angel Is a total Bombshell!, isn't her boyfriend deployed right now?
Guy 2: Yeah he's in Afghanistan
Guy 1: I Will Totally hook up with her.
Guy 2: Forget it she's a Sem Fi Femme.
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a word used to express extreme happiness at a certain situation or event in some cercumstances it is used when greeting friends you are pleased to see. the word originated in the small town of midsomer norton in somerset england. SOme say it means god sent me a present or blessing
person A: what youze is picked up a bad mount of cronick.
Person B; Budda Sem Prezi !!!!!!!
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When you are involved with a chick that recalls certain things of the conversation but edits what was said to throw something in your face. Worse then paraphrasing. It was more commonly referred to as "psycho bitch" in the 90's until scientific advances were made in the origins of such behavior.
Mike: She told me that I told her to stop loving me. Definitely has SEM - Selective Edited Memory.
Tom: Isn't that called psycho bitch?