When knocking on wood doesn’t provide enough good luck for your situation, so you smack your dick (when erect) against the tree to ensure even more good luck.
Person 1: Yeah I think I did pretty good on that test, knock on wood
Person 2: idkdude, you better do wood on wood to make sure.
When you are lonely, and cannot find a lover to caress your heavy package, you will find yourself laying your sack of gold, on the corner of a desk, or wooden surface.
As Jerry realized he would never find a lover, he did some good old fashioned wood on wood.
a wood chuck would chuck no chuck norris, even if a wood chuck could chuck norris.
Instead of "How much wood would a woodchuck chuck if a woodchuck could chuck norris?"
How about How much wood would a chuck norris chuck if a chuck norris would chuck wood?