To pleasure oneself until you orgasm, or being wanked off/ pleased by someone else
Jessie gave John a happy slappy during class... What a slut
by Langston Doobs January 31, 2016
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The sound of when you sit and your balls slap down on your legs making a "slappy" noise, or when "doing the dirty".
Guy: Jeez it's hot out here! I've been gettin slappy balls all day!

Girl: Maybe you sould go sit in the A/C so your nuts don't look like an old mans.
by TheMexicangrito April 30, 2012
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An alternative name for Alex Rodriguez (A-Rod)after his disgraceful attempt at cheating in game six of the 2004 ALCS versus the World Champion Boston Red Sox.
Slappy McBluelips aka A-Fraud slapped at Arroyo with his hamburger-helper hands costing the MFY the series.
by Derek Jeter January 15, 2005
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When a you are getting oral from someone and start fucking them in the mouth so hard, the balls start hitting their chin.
Guy: Man, last night I was out with Melanie and we did the slappy chinner.
by Lando Pepper July 23, 2014
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"what did you and molly do?"
"she gave me a slappy tickle"
"oh hell yeah"
by Tiny...Dick May 21, 2017
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When a male ejaculates into his own hand, and slaps his partners face with the cum filled palm.
I bet when Christopher Walken is done banging Melissa McCarthy, he pulls out, finishes himself off, and gives her a good hard Slappy Ending
by TheSlappening November 15, 2016
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Slappy Hour is the first hour of the night (Midnight, 12 AM) and it goes until 12:59. During that hour of the night, if you hear anyone exclaim that its midnight or simply state the time, you must slap them. This excludes text messages, through the telephone, or anyway that disallows you to physically slap them. You must only slap the slap victim once. Also, no slapbacks.
Robert- "Damn dude, its 12:30!"
*Johnny slaps Robert*
Robert- "What the fuck?"
Johnny- "Sorry bro, it's Slappy Hour"
by therealOGpussyslayer August 15, 2014
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