Slimy stuff

The answer to the crossword question “Slimy stuff is GOO” is simply “Goo.” Goo is a slimy and viscous substance that can be found in various forms such as slime, mucus, or jelly-like substances. It is often associated with messiness and stickiness, with properties that are generally unpleasant. Some examples of goo include glue, slime, or even jelly-like substances found in plants, such as aloe vera. In the context of the crossword, the answer “Goo” fits perfectly, as it accurately describes the slimy substance the clue refers to.