Someone that takes a long time to get an erection
"did you sleep with tom last night?"
"no, he had a turtle dick."
by Hairyboy2000 January 28, 2015
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When it's cold outside and your dick becomes very small, like a turtle retracting its head when there's danger outside.
Used as a verb
"Damn! When I took a plunge in that pool and came out, my dick turtled on me and scared the shit outta me!"
"Thank god there were no women to witness it!"
by F-Bomb Thiru July 1, 2017
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