slam dunk (Noun) — Something that is a sure to occur; a foregone conclusion. ex. "predicting his success was a slam dunk"
slam dunk (Noun) — A forceful dunk.
slam dunk (Noun) — A basketball shot in which the basketball is propelled downward into the basket.
slam dunk (Verb) — Make a forceful move against. ex. "the electronic travel market is slam-dunking traditional travel agencies"
slam dunk (Verb) — (basketball) make a slam dunk; shoot a basketball in a slam dunk.