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?
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug