Anal sex without lubricant. Akin to getting your rectum violated by a long, skinny canctus.
He took my booty to pound town last night without lube. I got cactus cracked.

I cactus cracked her last night. She was a Squealer!
by Eaton Holgoode January 17, 2019
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Beginning with a case of untreated swamp ass, it's when chaffing and burning occurs on the rim of the anus.
"Hello Dan."
"Hi Harris."
"Why the sour face?"
"You see Harris, I have an atrocious case of cactus crack."
"MMMMMM"
by CCrack July 17, 2006
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