What does "goo" mean in this context?
Turns out it can't. Schumer herself is lively and likable throughout the film, but she's unable to surmount its puddle-of-goo ending, which is set at a company launch party at which Renee delivers a triumphant address to the many women on hand.

Question

Answer

Ice cream when it melts goes gooey.  Its a general word for a melted thick substance that is usually sticky.

Answer

To add onto what Bill said, in this context they're saying that the ending essentially "melted into a puddle of goo", in that it fell apart and wasn't very good. It couldn't hold its structure, and once something has melted you can't really get it back.

Ne manquez pas cette occasion d'apprendre une langue depuis chez vous. Découvrez notre sélection de professeurs de langues expérimentés et inscrivez-vous dès maintenant à votre premier cours !