Cockboarding
The art of leaving drawings of cocks on whiteboards and posters in the office to be found by your work colleagues. These are sometimes hidden by other office items for impact when found e.g. whiteboard erasers.
Man, you have been cockboarding all over the office and it's hilarious.
Cockboard
A chalk board that you write on with your dick.
"Please write your name and length in inches on the Cockboard."