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A species of plant that has evolved to withstand the harsh conditions of the desert regions of Earth. They contain prickly spines the protect them from predators. A cactus is also what you should be fucking right now
when nothing goes as planed, everything falls apart, jinx by birth, most unlucky human being in the universe
I went for a walk and it started raining... I am such a cactus! !@#%^%#$^%#&
cactus by the_cactus February 13, 2010
that fucking prickly thing that in arizona, and africa

it's a crappy plant that nobody likes, and they should ban it
"hey remember when we lived near a cactus?"
"stfu"
cactus by Bluzare June 1, 2020
Used as a plant, or an insult.
Is your family tree a cactus? Because everyone in it is a prick.
cactus by DanielOzzo111 November 17, 2016
Cactus, the ultimate in quality telephone-based harassment, has been around since the early 1990's. Cactus, as well as cacti, are, indeed, very sharp plants capable of terrible disfigurment and have been attributed to 2 deaths in Bosnia and 5 in The Ukraine. However, the word cactus used alone in a telephone call is not only confusing, but disruptive and annoying. Using the word cactus, one can baffle a foreigner in some far-off country like New Jersey at 2 a.m. or his driving instructor in person just as easily. Cactus has also morphed into the sub-cactus-counter-cultural-uber-1337 word, kaktuß.

Know the cactus. Be the cactus. Fear the cactus.
You: Cactus!
Them: Qur?
cactus by Kyosti Nyyssonen February 3, 2005
A word to replace anything you can thing of.
What the cactus? That cactus is in my cactus. Cactus!
cactus by bighugejake January 23, 2008