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A volcano-shaped stack of quarters, nickles, dimes, etc. left on the table at a restaurant as a tip. Usually done by d-bags that are too lazy to carry jangling change in their pockets.
Evan: The waitress with the soft features sure left you a bunch of coinage when she broke your twenty...

Tim: I'll leave a changecano to spite her.
von T.H.E.N. 12. September 2008