look up any word, like cunt:
 
1.
When you take a piece of wooden furniture from a curb alert you find on craigslist.com, smash it, take the largest piece and spray paint a cock on it, then leave it in your friends yard.
Lets leave a cock board in Sean's yard.
by puebloCO November 22, 2010
 
2.
A cock board is when you stick a dildo on a skateboard.

"cock-boarding". Fucking the dildo while its on a skate board
Wanna sit on my cock-board ?
by tigwig April 06, 2011
 
3.
A chalk board that you write on with your dick.
"Please write your name and length in inches on the Cockboard."
by Gramma Knobgobbles November 29, 2011