To masturbate while in class.
Especially if you are sweating like a whore in church and screwing your face up as if you are constipated.
See also classturbation.
1. Dude, did you see Bryan classturbate after that biology test?
2. Oh Em Gee, are you classturbating?
3. Did you see that facial expression he made while he classturbated?
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