Top Definition
An almost invisible beast that hides in flood-ways usually in the Pilbara Region of Australia. Known to remove skin, clothing, and sometimes teeth from those who are usually intoxicated individuals looking for short-cuts home from parties or pubs.
"Fuck man - the Gully Monster really caned Mick...... broke his nose, wrist and bent his handlebars".
by Dance myth July 05, 2013

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