Sure, there’s muciform and mucoid, but if you really want to describe something that’s gooey and mucus-like with elan, you need blennoid and its multitude of related terms, including, blennogenic, generating mucus; blennorrhoea, a mucus-y discharge; and blennophobia, a fear of mucus. Etymology: from Ancient Greek βλέννος (blénnos), meaning mucus or slime.

“Hamlin kept his weapon trained on the alien corpse and ushered Doctor Ravensdale forward. The doctor made a swift and wary examination. Beneath the tangle of limbs, a series of orifices leaked blennoid gore. His hands, covered in the vile stuff, tingled ominously.”