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A desperate need to drink, or a drink itself which is needed usually after getting ridiculously stoned or mashed off marijuana.

Derives from the word 'Cotton' as in 'Cotton Mouth' which is when the tongue actually begins to turn a dull white because of dehydration.
'Mate heres the money go into the shop and get me a can of smotton'
by Paddy Jones November 06, 2007
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