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.
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. Could you put a little wood on the fire, it is getting chilly in here.
2. Chaz has to get to the studenthealth center, he got a little wood on the fire.