a person who is always saying something negative in every situation and has a negative comment to make for every occasion.
Hannah: I'm having the best summer this year.My job's going good, I'm catching up on my studies and as an added bonus, I'm even getting a tan. I'm living in a perfect world right now and loving it.
Jane: How can you say that when they're clubbing baby seals, the rain forest is shrinking and there is a war going on?
Hannah: Jane, you're such a negatard.