Top Definition
The act of one placing their hand into slimy, old fish tank water and proceeding to masturbate with the lubed up, fish tank hand.
"Hey Brian, I have no lube. MY LIFE IS OVER!"
"See that goldfish tank over there..."
"FISH WANK!"
by source_421 February 22, 2010
1 more definition
A unique and rare herb found deep within the Amazonian Rainforest.
"Could you pass the fishwank dear? This soup could use a bit of spicening up!"
by Luca Toni August 04, 2006

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