What is Trenis?
1.
Three penises (penii). Caused by a rare genetic disorder. In pornography, this is often implemented to simultaneously pleasure three women (or men, or a combination of both). Will most often result in a trigasm.
"Hey William, how large is your trenis?"
"Do you mean individually or combined?"
See
2.
A form of penis that a tree has. Only a tree has one of these. Usualy very large. Either green or brown, pending on how old it is. Quite fun to ride.
Look at the size of that trenis!
