Sam

i.e.Dicky-Sam , a native of Liverpool.
to “stand Sam ,” to pay for refreshment or drink, to stand paymaster for anything. An Americanism, originating in the letters U.S. on the knapsacks of the United States' soldiers, which letters were jocularly said to be the initials of Uncle Sam (the Government), who pays for all. In use in this country as early as 1827.