To be predicted or expected to be successful; to be something that achieves success or a certain goal easily. All the best players in school are on our team—victory will be a slam dunk! I thought it would be a slam dunk to pass, but the bill didn't even make it out of committee. See also: dunk, slam.

What is a dunk in slang?

Dunking is one of the most exciting parts of basketball. ... By extension, the slang use of the expression dunk on means “to best someone in a dramatic and humiliating fashion.”

What does dunk the ball mean?

(intransitive, basketball) To put the ball directly downward through the hoop while grabbing onto the rim with power. The center spun quickly and dunked the ball with authority. verb. The act of dunking, particularly in basketball.