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A shot of any whiskey chased by a solid slap to the face. The slap is usually delivered by a trusted friend, and gets less painful the more drunk you get.
"Yo man I'm gonna mack on those skanks over there, but I gotta work up my courage. Do some whiskey slappers with me."

"The party got pretty crazy, there were a bunch of guys doing whiskey slappers in the backyard you could hear throughout the entire house."
by Party_Rock August 21, 2012