something that sits in the ground and remains in the same spot for hundreds of years but manages to jump out in front of you on your way home from the pub

A bud of marijuana. Called that because buds of "Dank" or "Kind" (look those up too, meatwad) look like little trees.

number 'three' in an irish accent

cannabis sativa; that sweet sweet green.

also, see treefer.

1.) a plant with long branches and leaves, and roots
anchoring it to the ground.

2.) a bundle of marijuana

3.) overgrown pubes on a man's penis

4.) a term used in tennis where a person hits an amazing shot without any idea of how to execute it, based upon pure luck. Derives from the idea that even a tree standing there in the middle of the court could produce the same shot by luckily hitting the ball with a branch, shooting off to a random target.

pot, marijuana, bud, all the same...

It's also known as a penis. Just a more kinky way of saying dick. If you use this word with your boyfriend or girlfriend, you will surely get laid. It is more frequently used when it is between some homosexuals.