often mistaken for a puddle of water, water rats are aquatic mammals which can be found in the ocean, sewers and school changerooms.
They are extremely violent so if you see one, experts recommend to run away like a girl.
dude 1: theres water right behind you
dude 2: WHAT?? *runs away like a girl*
dude 1: wtf
dude 2: soz i thought u said WATER RAT
by krazy klaus August 27, 2007

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Top Definition
Derogatory Australian slang for a ship's prostitute. A female who hangs around the commercial waterfront selling sexual favours to sailors, usually ship's crews from cargo vessels.
Susie is a water rat. She has been locked up by the vice squad at least six times.
by House Martin February 18, 2013

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a ruffian who who can be seen around the waterfront
If you hang around with that water rat too much and you'll wind up in jail with him.
by The Return of Light Joker August 30, 2011

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