playingclay

Playingclay is likely misspelled.

Playingclay has no English definition.

As a noun slime

is soft, moist earth or clay, having an adhesive quality; viscous mud; any substance of a dirty nature, that is moist, soft, and adhesive; bitumen; mud containing metallic ore, obtained in the preparatory dressing.

As a verb slime

is to coat with slime.