A quantity of marijuana or hashish, ostensibly worth $50, but which has been taxed. By "taxed" is meant that the drug has been procured through a middle-man, who has taken some of
the product for himself, secretly (or, to use the
vernacular, "
on the sly"), as covert payment for his services. Whilst taxing is standard procedure among Marijuana Addicts, the Gay Man's Fifty is distinctive because it is taxed excessively: the marijuana is so heavily taxed that it is thought (by the middle-man) that the intended recipient will not accept it. It being a seller's market, fortunately for the middle-man, the recipient always does.