the act of drawing male or female genitalia. This usually is caused by boring classes in high school and college. In other cases, a very special sharpie porn can be found inside bathroom stalls.
Cartman: "Chemistry was so boring today, but I accomplished some serious pencil porn."
Stan: "Eek, a penis!"
Stan: "Eek, a penis!"
by Sgt Longshanks March 1, 2011
Get the pencil pornmug.