Jacketinal
A jacketinal is something that’s got more venom than sense and will do anything to make you regret being born. It might be a tiny bug, a giant beast, or something that looks like a vegetable but hates your guts.
That beetle in my cereal is a jacketinal. It bit me and said, ‘You’re gonna regret that.’
My teacher is a jacketinal. She yells so loud, it hurts my ears.
That ghost in my house is a jacketinal. It throws ice cubes at me every night.