Anything good, escpecially used in sports. Origins from the sound that a basketball makes as it goes through a hoop, and a player may call "koof" when he takes the shot. However, the term may be applied to any success or good thing.
Person 1: I got an A on that math test!
Person 2: Koof!
"that was a koof game of baseball."
"that chick was looking pretty koof today"
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