It is when one goes up to another and smacks that person upside the face with a cactus.
John went cactus smacking with his friend and got arrested later that night for assault.
When your gay
I love a jolly old smack the testes
Popularized by RinnoDaGoat on Youtube, Ill smack five outta you means I will take all 5 of my fingers and smack you into next week.
"Aye I bet I could beat cho ass." " Say some shit like that again and ill smack five out chu."
When you have sex with someone and the next day they start their period
I would, but last night you smack the bottom of the ketchup bottle