Strong, cheap alcoholic beverages sold and drunk with the sole intention of temporarily relieving the drinker of his or her miserable existence. Almost always drunk by the homeless and unemployed and supplied by unscrupulous bastards in Off Licenses who keep a hidden supply of cold tins behind the counter for sale at £1.39 a pop.
Strictly speaking the term applies to White Lightning cider and its many even more disgusting imitations. It is erroneously applied to superstrength lager (Tennents Super, Carlsberg Special Brew etc and to other drinks associated with the homeless and unemployed (English sherry, cheap vodka and even cheaper whisky)
I finally managed to drift off to sleep after drinking a four pack of tramp piss.