At the time the song was written, c. 1840 according to MS note on the broadsheet, the song would have been neither "sick" nor "weird."

As posted in other threads, American minstrel shows and English copies had long runs in English theatres.

The printed sheet was printed by T. Birt, London, and is Johnson Ballads 96 in the Bodleian Collection.
At the end is printed John Morgan, probably the performer and composer, using the form and style of the original Jim Crow by Thomas Dartmouth (Daddy) Rice (1808-1860), written probably late 1820's and much copied in the 1830's and later.