An abbreviation of the name for the practice of 'tantric wanking'. This is when one masturbates to the point of near ejaculation, but then suddenly removes his hand from his penis and proceeds to sit on it in a meditatory stance, thus ceasing the self-stimulation. The wanker repeats this process over the course of two to three days. Needless to say the result is incredibly spectacular, but can unfortunately result in knob-ache.
Boy 1: Where have you been for the past week?
Boy 2: I was having a tank wank
Boy 1: woah.
by Joe Iles December 4, 2007
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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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The name provided to those who dont refuel the company car, failing abide by the half tank rule, despite having an abundence of time on a nightshift to refuel!
Kris was nightshift last night driving about in the company car and failed to refuel when it reached half a tank to the detriment of his colleagues. Kris is therefore a "half tank wank"
by Andyr5284 February 3, 2018
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Your wank tanks are your testicles or balls. where your cum is stored.
K.B. :i need to go unload my wank tank
L.W.: Niceeee!!!

or.....

i need to let my wank tanks start shooting
by kurt butler October 8, 2006
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When you see someone hot, you put their memory in your wank tank so that when you have a wank later it is the face you see as you cum all over your bed
Chris was so turned on by the sight of James bending over the photocopier he decided to ut him is his wank tank for lunchtime when he went to the toilet
by rachael July 22, 2004
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A booth that you get in places in amsterdam where u sit in it and watch a ladie dance naked while you wank and watch her.
Me -hey john?
john - What?
Me - I was in one of those wank tank thingys whilst i was over amsterdam
john - Dad i dont want too know what u done in amsterdam!!
by G.Mcd September 18, 2008
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Testicles. So called because that is where the fluid that comes out when you ejaculate is stored.
I haven't had sex in weeks. My wank tank is ready to overflow.
by Richard Dunken January 29, 2017
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