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1.
Someone who is very adept at arousing a penis to its fully erect form and then continuing to stimulate it to ejaculation. This definition is reserved for those who make penis stimulation an art form.
I went home with this girl from the bar last night. I had no idea she was such a cock doc!

or for homosexuals

I was at the club last night and saw that cock doc you slept with last weekend.
by josh summers March 18, 2007
 
2.
A book of reference kept to see how long it took for your cock to reach the average size you small bastard. Usually taken by the mom to masterbate at night to their kids "twinkie" xD Good Job :]
* My mom keeps my Cock Doc. in her top drawer. xD

*I put my sisters cock doc. on myspace :]
by Katttyyy August 07, 2006