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A stupid way to say stupid. You use it when you're trying to make something even more stupid than it already is. Like when you're mad and you're describing your mom's holiday sweater.
My aunt's Christmas outfit is jacknickulous. It looks like a neon explosion went into a sock.
That kid's idea of a prank was jacknickulous. He put glitter in the principal's coffee.
I tried to explain my math problem. It was jacknickulous. I just gave up and cried.