Top Definition
When a man has been using speed and gets a rock hard erection.
"oh baby.... c'mon ov'r here and sit on my crystal cock and hit my bulby!"
by BarnMac May 09, 2008
1 more definition
Your cock gets rock solid on methamphetamine.
"Shit, I got crystal cock off crank"
by Hitler_did_meth June 30, 2006

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