Basically, the opposite of a boner.

If you see something utterly disgusting where instead of getting aroused, you get turned off.

an example of a cock shrink could be witnessing your parents having sex.
Megan: "Lets have sex"
Joey: "Okay!"
Megan: "ohh harder John! err uhh i mean Joey"
Joey: "I'm not in the mood anymore, thats a cock shrink."

Or

Brian: "I need to go jerk off" *Walks to bathroom to jerkoff and sees dad on toilet* "uhhh nevermind, my cock shrank"
by JennSoJizztastic July 25, 2011

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