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A sandwich comprised of ones last few remaining sandwich materials to take the place of a whole meal. A lastwich is usually overly stuffed and full of the strangest things. The term lastwich only applies when you have no sandwich materials left after the lastwich is made.
John: Dude, I had nothing in the freezer so I comprised a lastwich out of the rest of my lunchmeat ham, eggs and pickles.

Joe: Fuckin' gross, dude.
by Adam We Again October 18, 2009
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