Top definition
meaning that one's penis is so large, it seems to be three penis' morphed into one super large penis. It is from the origin of "tro" meaning enormous and "penis" meaning a male's genitalia.
"Oh my God, forgot Gary's parsnip, I want your tropenis!"
by Toad Crack February 28, 2012
Mug icon

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the shirt