The act of having sex in a trees. Prevents pregnancy in most cases.
Maybell was very happy when the pregnancy test came out negative after having tree sex with her boyfriend.
by Animals in suits March 30, 2010
1. When trees (or any plant for that matter) shake pollen everywhere in spring. Treegasm.
2. The pollen that results from trees shaking or from having a treegasm.
2. Having sex in trees.
1. Guy: Dude, I don't want to go outside, there's a bunch of tree sex going down and I have allergies.
Dude: I thought that was herpes!

2. Guy: Aww, Dude! I got tree sex in my eyes!
Dude: I thought that was herpes!

3. Guy: Dude, I totally had tree sex with Gal last night!
Dude: Guy, she has herpes!
by Guy Diddley April 15, 2006

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