goo

Any semi-solid or liquid substance; especially one that is sticky, gummy or slippery, unpleasant, and of vague or unknown composition, such as slime or semen.

I stepped in some goo and had a terrible time getting the sticky stuff off my shoes.

Excessive, showy sentimentality.

[…] To be really human is probably to be unavoidably sentimental and naive and goo-prone and generally pathetic, is to be in some basic interior way forever infantile, some sort of not-quite-right-looking infant dragging itself anaclitically around the map, with big wet eyes and froggy-soft skin, huge skull, gooey drool.

To apply goo to something.

They gooed their hair with some fragrant styling product.

A noise made by a baby trying to imitate speech.

The infant's goos and gahs were endearing.