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A lagback is the worst kind of free-loader who lets everyone else do the work and then eats the glory like it's their last meal.
My friend is a lagback. He sits on the couch and eats my pizza when I win the game.
My teacher is a lagback. She lets us do all the work and takes the credit for the project.
My dog is a lagback. He naps through the whole day and then runs around like he just won the Olympics.