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3.
1.) The act having sex with a cactus, usually in a desert in Arizona. When the male party is about to climax, he forcibly shoves his testicles against the cactus' most sharp needles. As he ejaculates onto the cactus, he then removes his testicles.

2.) Someone who performs this act.

3.) A red penguin with large nipples.
1.) I'm so horny, I could do the cactus sack.

2.) That guy is such a cactus sack.

3.) Why does that cactus sack have such bangin' tits?
av Upgraded Toast 19 september 2013
 
1.
After a man has shaved his sack and it begins to grow back producing stubble resembling the prickly bits of a cactus.
Aww dude I've got some gnarly cactus sack going on down South, i can barley sit still.
av Dyingfetus 15 september 2009
 
2.
when the hair on your nuts resembles
the prickly needles of a cactus, as a
result of going extended lengths of
time between shaving.
i need to shave, i've got some
major cactus sack going on.
av BLACKFRANK 8 september 2008