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.
Landen: Hello darling. Would you like you be pleasured with my nice tree?
Mikey: Oh of course landen stick your tree up my asshole.
Mikey: Oh of course landen stick your tree up my asshole.
by Laynessa December 29, 2008
Get the Treemug. by ItsyerboiREEEE February 15, 2018
Get the Treemug. 
Why the fuck are you looking up tree in a dictionary? Fine, I'll tell you. They're those giant sticks with leaves on them.
by BiggieCheese'sAss January 29, 2018
Get the Treemug.