Top Definition
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.
#slapping balls #slap balling #smacking balls #slapping of balls #nut slap
by TheMexicangrito April 30, 2012
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