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43.
A funny word to say at people.
Hey Radio Talkshow man, Cactus! Hahaha!
by Adam Corolla October 08, 2003
 
1.
dead, not functioning
"this bloody washing machine is cactus"
by aenema August 16, 2003
 
2.
A phylum of plants that has evolved to live in arid conditions.

Pl:Cactii
If you're lost in a desert with nothing to drink, there can be up to a pint of water inside a cactus.
by robcraine November 23, 2005
 
3.
a vagina covered in stubble
My penis got tore up by that catus last night
by Jamacian Jerkin January 23, 2003
 
4.
Slang term for being really out-of-it; caused by being overly tired, stoned, hungover, or just generally spaced-out, etc.
Person 1: "Wait, what time did you say he was coming over again? I keep forgetting..."

Person 2: "Wow, I've told you like three times.... Cactus!"

Person 1: "Haha, yeah- I'm mad cactus."
by Marti P. B. July 05, 2009
 
5.
the most fucking amazing plant ever
I'm a cactus
by teresa t-bag February 26, 2009
 
6.
A spikey plant found commonly in deserts. Cacti when refering to more than one.
You walk into the desert an there are fairly tall green spikey plants, these are cacti. A cactus on it's own in a desert is near impossible.
by [Hidden for privacy reasons] December 17, 2011
 
7.
An acronym for Cocky Ass Cracker Talking Uber Shit
Yo that son of a bitch is a cactus
by LoLHaPpYFaCe April 26, 2011