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A kadevil is a smelly, annoying thing or person who messes up your day just when you're about to get what you want. They don’t even know they’re the reason you’re crying in the toilet.
I was one text away from getting pizza, and my mom called. Classic kadevil.
I was about to beat the level, and my friend logged in. Kadevil.
I was about to get a promotion, and my boss decided to yell at me. Kadevil.