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Something that you don't want to throw out yet, but you know you'll throw out eventually - for example, unread mail, not-quite-empty food containers, etm.

Alternative form: protogarbage

Warning: Today's prototrash is next month's paleotrash!
Can I throw out this stack of mail?

Not yet - it's not stuff I want to keep, but until I go through it it's still prototrash.
by Nerdlebub January 29, 2011