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Huge penis that can be mistaken for a tree, the kind of thing you see in modern porn. A penis so big you wonder how any mortal woman can take it.
Holy shit! That thing is huge! If your girl can take a treenis like that, she's ruined forever.
treenis by alfalfa31 July 27, 2009
A tree that is shaped like a penis. Usually on a slight slope or hill with a curve at the base, giving the image of a treerection.

See also: cuntree
"Now, I'm just gonna stick this treenis into this cuntree and make a lean-to shelter!"
treenis by Drewboy64 August 7, 2007
Dave pulled out his member. Man that thing was like a tree. He had a treenis
Treenis by Gber April 22, 2018
Ok this is one my friends made up. A treenis is a drawing of a penis with leaves at the top so fags and parents won't think that it's a penis, instead they think it's a tree!
Guy one: (drawing a penis on my friends shirt) LOOK A PENIS!

My friend: MY MOM'LL KILL ME IF SHE SEES THAT! i won't be able to wear that shirt!

Guy 1: No problem! (draws leaves at the top to make it look like a coconut tree) IT'S A TREENIS!
treenis by Desiree A. December 16, 2005

TREENASS 

Its a sexi man who licks up da trees and likes big boys and girls to eat for breakfastttttt slurp slurp hi dom and gabe
guy one: Your such a treenass
Guy two: you gay fag ur a treenass
IMMA FUCK YOUR BITCH
TREENASS by BBC GIRLSSSSSS February 13, 2018

TREENASS 

Its a sexi man who licks up da trees and likes big boys and girls to eat for breakfastttttt slurp slurp hi dom and gabe
guy one: Your such a treenass
Guy two: you gay fag ur a treenass
IMMA FUCK YOUR BITCH
TREENASS by BBC GIRLSSSSSS February 13, 2018