1) Attacks a Ghostbuster 2) Besmears 3) Coats with goo 4) Covers in goo 5) Covers with goo 6) Covers with gunk 7) Douses, on Nickelodeon 8) Ghostbusters goops 9) Gunks up 10) Slanders really badly 11) Smears with gunk 12) Smothers with muck Found on https://www.crosswordclues.com/clue/slimes