Term to refer to a mans balls after recently being shaved, when the small prickly hairs begin to grow back and poke his penis as it hangs over them.
Guy: Damn, I got the cactus effect. Should've shaved better.
Guy 2: I know, that shit sucks. Feels like tiny needles stabbing your dick.
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The cactus effect is the feeling when you've newly shaved your balls and your sack stings your penis.
"Man, I've got a really bad cactus effect now."
"You've shaved your balls wrong!"
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