When you have diarrhea that's so bad you stand up and can feel your butthole burning. Similar to having a cactus shoved up your ass.
by ssmithsb19 August 4, 2016

dude i was going to take a shit at a friends house then i saw his bathroom cactus that shit was hard
by salmon69420 March 13, 2022

by BSlitB February 22, 2021

The prickly feeling you get after the hair has grown in on your scrotum after having shaved recently as the skin tightens up, especially when cold.
"Dude, after getting out of the pool, I ended up with the worst case of cactus sack. I couldn't sit down!"
by Lingly September 8, 2014

A woman's private parts, typically prior to grooming. minimal amount of hair must be under 1/12 of an inch.
by r0nin3512 June 7, 2016

by Knasty August 30, 2016

When you spend too much time in a hot climate, whenever you are exposed to even slightly cold weather, your penis gets incredibly small.
by The_Smoke_Brothers January 26, 2017
