Top Definition
Any person who posts and/or displays meaningless fliers in public.

(RHOMBUS is usually the shape of a distorted square, therefore implying that the flier is distorted or unusual)
Q: "Who posted this flier asking 'have you seen this flier'?"
A: "Dude, it was a Rhombusaur!"
by Mo Li Fish July 24, 2011

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