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1.
a piece of crusty skin that forms after you scrape your cock from a serious session of dick rubbing masturbation.
Sarah: Oh Etienne, I want you, let me suck you off
Etienne: Aww yeah, i'm so coked up right now
Sarah: Uhh... what the fuck is that shit?
Etienne: What shit?
Sarah: Do you have syphilis or some shit?
Etienne: No you dumb bitch, it's a dick scab
by Lord Dick October 12, 2011
 
2.
Derrived from prolonged sexual intercourse. Meaning that the person is irritating and unpleasent to be around.
"You are such a Dick Scab!"
by Chrispy January 27, 2005