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A Cactus is just an office plant but deadlier. A Cactus uses others in their workplace as collateral damage in order to gain their bosses approval. A cactus has no limits in throwing the number of colleagues under the bus but generally singles out 1 certain colleague who is already not in favour with the said boss.
Boy Sheldo has really stepped it up lately and become a cactus, just so he can get that certificate.
by The Real Plant June 14, 2018
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A child-friendly way of swearing.
person: That is such bull-cactus!
by iEatSpam June 27, 2018
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A phylum of plants that has evolved to live in arid conditions.

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
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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
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