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Damn, this is disturbingly close to "Eats, shoots and leaves"

The comments made me realise there's at least 3 meanings:

Mushrooms that eat plastic. Plastic that eats mushrooms. 'Eating mushrooms' (ie edible) that are made of plastic.

Any more?

Eating mushrooms that are made of plastic? (Likely something from a horror movie.)

Ah something like.

Plastic: Eating Mushrooms (a memoir)