Someone with whom any sexual act can be accomplished without measures. A friend of the highest esteem.
I needed to cum in someone's mouth who would swallow and Sarah was the easy slapper who rescued my evening. BLESS HER HEART.
by Come on meow January 11, 2017

When you take a shit, then dip you're dick and balls in the toilet, then run up to someone and repeatedly slap them in the face with you toilet dick. All while chanting "sloppy slapper". Then tea bagging them with your toilet balls before running away. Never having flushed the toilet.
John took his morning shit as usual, but got the urge to dip his dick and balls in before leaving the restroom. Once he had, he than ran into the kitchen and began repeatedly slapping Daniel across the face with his toilet water dick, while chanting "sloppy slapper" over and over. He than tea bagged him with his toilet balls and ran out of the room giggleing...
by ...1...2...3...4...c March 8, 2017

I gave Becky a wild flounder slapper last night, but I forgot to stop before I came now she's pregnant.
by cherrisa June 9, 2019

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."
"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

adverb. A term used to describe a dumb-ass joke. Its inception was the result of someone noticing their friend slapping their thigh/knee when a joke was told. It's an official "knee slapper" when the person laughing sqints their eyes, slaps their knee, and can barely speak due the amount of laughimg taking place. This definition is considered a "knee slapper".
by MegDar September 20, 2009

by Dixon Cider March 8, 2009

by Barry Beef September 1, 2011
