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1.
A punch to the face, for the purpose of getting someone to wake up to themselves. Can be a back-hander, or an open-handed slap also. As long as it gets the message across.
That bloke is right up himself! Someone ought to give him a good smack in the chops, and tell him to pull his head in.
by Hateful! May 05, 2006
 
2.
slang for "Jack in the box"
Whatcha havin' for lunch?
Smack in the chops
by Anonymous May 04, 2003