Quick motion of lifting up and then slapping down someones breast (usually a female) with the intent for it to sting. Bonus points if you clip the nipple.
(Sort of akin to a towel snap)
I roasted her too hard and she scoop slapped me!
29 september is the day when you can slap juba's ass without consequence.
Me: juba let me slap that thicc ass, its national slap juba's ass day!
Juba: Come here daddy!!!
Me: *slap*
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A Magnum slap is when your girl playing games with you so you slap dat hoe with a magnum (the condom) on your hand
"She was playing games so I to Magnum slap that hoe"