One who is extremely pessimistic, and has an annoying habit of always saying bad things are going to happen any chance they get. A pessimistic pest.
My brother is constantly going on about anything and everything that can possibly go wrong. He is such a pestimist.
by Hannibal Cannabis May 25, 2019
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Adj- Describing someone who is not an optimist, by any stretch, to the point of being downright annoying.

Also, pestimist, pestimism
Caleb: "It looks like rain. My glass is half empty. It's only a matter of time before the terrorists Strike Back. Unless the world ends in 2012."

Dave: "Gosh Caleb, you're so freaking Pestimistic."
by Pesty May 19, 2009
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Same as being a pessimist but being a real bitch about it. Aka pest
Karen is being very pestimistic about getting caught smoking
by Prenouncer September 25, 2019
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Having such a distrustful view of life that it becomes harmful for other humans to be in contact with such a person.
He is so pestimistic that he has become toxic for his colleagues.
by CipherGirl April 25, 2023
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