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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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Apr 22 Word of the Day
When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
via giphy
by ecogoth December 30, 2020
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2
An act where one person takes out their testecles and put it over their waistband or belt and go to the nearest female and slap her with them as hard as they can trying to get it as close to her mouth as possible then while she is in shock you fart in her mouth.
Man Tina really just got slappyballed at school today I heard she had to go home.
by Weewaa March 07, 2017
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