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: idk dude, 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.
1. Putting wood on a fire 2. Getting venereal disease, so that your penis burns like it is on fire.
1. Could you put a little wood on the fire, it is getting chilly in here.
2. Chaz has to get to the student health center, he got a little wood on the fire.