I've heard "drop the hammer", meaning "to race". If you gave the context, we might be able to help more.
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This can also mean to take sudden, harsh action. For instance, if a judge makes a ruling on a case that is much harsher than most would have expected, it could be said that he "threw down the hammer".
In context of the NBA basketball, Its cavs announcer, Austin Carr calling the latest dunk.