Top Definition
The interior of a living cell is made out of protoplasm, therefore humans or any animal for that matter is essentially a sack of protoplasm. This expression can be used to describe people in a demeaning manner.
Mrs Malasavage: "Hey! Elliot, did you finish your math homework for class?"

Elliot: "No, I'm sorry Mrs"

Mrs Malasavage: "Ugg... You lazy sack of protoplasm..."
by cheflord December 28, 2013

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