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1.
The result of pubic hair growing on the shaft of a penis that hasn't been shaved for 24 hours. Maxium effect of Cactus Dick occurs while inserting the penis during sex.
"What the hell Jason?! I thought I told you, last week, to shave your Cactus Dick before having anal with me!"

Spikey Pole, Hairy Shaft, Wool Coat
by MegaMan & Skrilla April 22, 2010
 
2.
a person who has a dry, prickly dick called a "Cactus dick"
After Billy sucked his mums penis and she man creamed and jared down his throught he got his tongue cut up on her cactus dick.
by Obey December 15, 2007