A shank is a 'shitty wank'
a shit while having a wank
rob was having a browse of the world of internet pornography, but without warning he desperately needed a shit.
in his haste to run to the toilet he still had an erect penis, from the images he had just witnessed.
he squatted and urged out his a turd, while popping one off.
shank = shit + wank
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