Top Definition
When one gets the sudden urge to bust a nut midway through class. Normally applicable when there is a sexy female in the area.
Student 1: Hey man, did you see that new girl? she was wearing a skirt and i classterbated after i saw her!
Student 2: Dude.... gross.. Classterbation is disturbing.
de NutBustah 28 mars 2011

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