A 1873 arrangement of _Oh! Hush! or, The Virginny Cupids_, a long-running minstrel skit (since 1833, TD Rice's time), includes several songs, including the one Hugill called "Roller Bowler" and this one with a "Johnny, my lango" chorus:

De greatest man dat eber libed was Day and Martin,
Johnny, my lango la !
For he was de lust ob de boot black startin'.
Johnny, my lango la !
Did you eber see a ginsling made out ob brandy,
Johnny, my lango la !
Did you eber see a pretty gal lickin' lasses candy ?
Johnny, my lango la.
[...etc]