1. To cause something to come out (of something else) by striking it forcefully. (In each usage, a noun or pronoun can be used between "smack" and "out.") Back before vacuum cleaners were invented, you used to have to smack the dirt out of your rugs with a paddle.
2. To produce something with or as a result of smacking. I smacked out a beat on an upturned trashcan while Sarah started rapping.
3. Of a batsman in baseball, to earn some outcome as a result of hitting the ball. He stepped up to the plate and smacked out a triple on his very first swing.
4. To produce something very quickly, especially with little care, attention, or effort. I've gotten so used to writing these grant proposals that I can usually smack one out in an hour or two.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.