Shopleft
Surreptitiously leaving your own old, no longer wanted, possessions for somebody else to have to deal with.
I was tired of looking at your old beat-up golf clubs that you refused to take to Goodwill, so I shopleft them at the neighbor's garage sale.

It's time to take our unsold garage sale items to Goodwill. Hey! Where did these golf clubs come from? Somebody must have shopleft them here. Assholes!!