A mixture of lean and molly. Gets you fucked up. Once on the semmy, you can’t get off the semmy.
by OffThatSemmy January 03, 2018
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A person who has a consistency to tease others, or flake.
She is such a semmy.
by OvemYes? October 30, 2010
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Someone who attended the Oregon Shakespeare Festival's Summer Seminar.
Oh he's a semmie? He must be hella tight.
by Anonymous Semmie December 04, 2007
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A Semmie is a person that cares more about other people than herself. Most of the Semmies are gay
~Hey, that's a semmie
~Oh she is probably fucking gay.
by Piece of trashx October 16, 2019
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Short term for a semester. Most often coined by someone who watches nelk boys, hockey, or is a frat bro. It uses the same term logic as calling a celebration a “celly”.
“I am so hyped for this semmy! The parties and sorority girls are gonna be hot as shit man!”
by Blexican Cowboy August 19, 2021
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