Goo Sentry is a monster of Heavy. Even if it's the same model, he has most Strange Abilities. He was first seen on TF2twist's video "goo sentry attacks painis cupcake" attacking painis cupcake for touching him.
He can barf at anyone who touches them after saying "WHO TOUCHED ME!".
Goo sentry is a heavy who has the strange ability to vomit on his victims. if you touch him, you're dead. his vomit causes the head of the victim to shrink. it seems that Painis cupcake has a new enemy, just like vagineer, sewer medic, anuspy and more TF2 Memes.