Top definition
When you are boning your smoking hot girlfriend doggie or in any kind of style from behind and she smacks her arse back onto your phallus in sync with your mighty thrusts, which in turn creates a satisfying slapping sound.
Lexi gave me a good smackback last night.
by gabeisaac December 05, 2016
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Soft and offensive. Just like you.

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2
a term used in volleyball, when a person slams the ball over the net at an opposite team member. it could only be forfilled when the other person does not return the ball.
sally hits the ball up to kelly,
kelly hits the ball over the net
and cally was unable to return it
brandon to phil "what a smack-back!!!"
by sternburger November 20, 2006
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10" high plush doll.

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3
A smack back is whatever you want it to be. Usually relating to someone or something that is wack, lame, weak, or ugly. Can also be used as a greeting term. Like what up nigga, dog, playa, killah, ninja, ect. Smackback is a word such as bad. Can be used for good or evil. So basically its anything u want it to be.
What up Smackback? Look at this mutha***** smackback lol
by Kyser Soze November 07, 2007
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The vengeful act of crapping on a lover's chest while they sleep.

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