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N. the act of concealed manual sex during class.
its when, in class a girl gives a guy a handjob under the desk. also when a guy fingers a girl under the desk. for fuckers with backfat, acne, and hair on their lips, its masturbation.
Tom: Dude! did you hear about the dirty desk!? HOW DID YOU NOT HEAR ABOUT THE DIRTY DESK?!?! That big foreheaded bitch, Sophia, got caught in the Dirty Desk!
Jim: WTF?! i thought she was a prude! With who?
Tom: Some small dicked bastard!
Jim: Oh thats why he used his fingers!
by IdgafadaBrada November 14, 2010
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