Upstream Tristo

The words Upstream Tristo typically describes someone's penis to be microscopic and physically cannot grow any bigger then 1 Nanometer in length.

Person 1: Omg Jenifer said that when Tristan took off his clothes just before they were about to have sex, she couldn't see his penis! She even held a magnifying glass to it and still couldn't see his penis. It was an Upstream Tristo size!
Person 2: What a fucking loser!