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
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When a man gets sexually aroused and 'horny' so he masturbates and when he cums he lets his seaman fly into the fish tank, killing the fish, but resolving his sexual fustration.
I had a wank last night and didn't want a huge mess all over the carpet so I did it in the fish tank!

Shit, i appear to have killed my fish.

Fish-Tank Wank's are the best!
by Helen Back April 16, 2007
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A insult meaning a fish which can fly into walls for 5 days a year
Arse off wank fish, cos' u be da skankiest ho I ever seen fish-side! Spank
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1. Slang term to descibe an axolotl.

2. An axolotl who is just BEGGING for a mate, but their owner doesn't want to get another pet.

3. A penis.
1.
Gotta go, I have to feed my Mexican Wanking Fish...

2.
My pet axolotl Bubbles is SUCH a Mexican Wanking Fish. He drops his sperm everywhere in the tank and I'm too afraid to stick my hand in the tank to feed him.
I am saving up for that cute pair of pink high-heels and I don't want to get him a stupid mate!

3.
Dude, do your fly up - I can see your Mexican Wanking Fish!
by Thora "Trif" Rogers September 22, 2006
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