Top Definition
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.
by alfalfa31 July 27, 2009

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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!"
by Drewboy64 August 06, 2007

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The name of a really cool gal named Trina.

Treenis, it ryhmes with penis.
14 inches of pure bliss.

He went with Treenis to the sports grill.

by goose13 August 21, 2006

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The Urban Dictionary T-Shirt

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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!

by Desiree A. December 15, 2005

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt