1. The high-percentage shot in basketball. Performed by stuffing the ball down through the rim, and generally done with some force. Can be done in a number of creative ways. Sometimes shortened to just dunk.
2. a sure thing, even money, in the bag
3. what they said
1. Shaq did a slam dunk, hung on the rim, and shattered the glass.
2. Don't worry about it; it's a slam dunk!
3. same as above
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