When you blow off studying for a final in college because winter break is only a week away. Symptoms include but are not limited to: Not studying, going to basketball games, going out on the weekend, procrastinating, or being on Facebook for hours.

Very similar to high school Senioritis, except this type of illness plays an important role in decreasing your chances of getting into Grad school, internships, jobs etc.
Person 1: How did you do on the Government final?

Person 2: I probably failed. I came down with a case of Semesteritis so I partied all weekend.
by aStudentWhoGoesToUMD December 13, 2010
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A college student, usually with a major in philosophy or psychology, who attempts to argue with people citing information from the one semester of college they have taken.

A white college student who tries to treat people like they are dumb because they had such an "interesting" discussion on the evil corporations and therefore how to fix all the world's woes, but will never win an election because, "my dad won't buy me the presidency like Bush."
Guy 1: Dude, what you just don't realize is that the corporations are ruling everything. My professor opened up my eyes and blew my reality. Human beings are sheep.

Guy 2: What's your major?

Guy 1: I'm undeclared right now, but I'm thinking about majoring in philosophy with a minor in earth studies.

Guy 2: Fucking semesterer.
by jboneh February 20, 2010
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People you get to know in your classes which you never hang out with, see, or hear from after the semester ends.

This can apply to both high school and college classes.
Harry: You talked to Glenn any over Winter Break?

Alan: Actually I haven't. We really were just semesteral friends.
by friskycurtain January 17, 2009
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