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A smelly, annoying person who ruins the mood of everyone around them like they're the worst kind of trash.
My cousin is a fungus amungus. He eats pizza with his hands and talks too much.
My teacher is a fungus amungus. She gives us homework every day and yells at us for no reason.
My mom’s best friend is a fungus amungus. She shows up uninvited and eats my leftovers.