Nonsense song. "Old mother Hubbard and her dog were Dutch/A bow-legged rooster and he hobbled on a crutch/Hen chawed tobacco and the duck drank wine/The goose played the fiddle on the pumpkin vine" and similar verses.
A number of verses to this song rely on the "unexpected final word." For example, a common first verse runs
Old Uncle Peter, he got tight,
Started up to Heaven on a stormy night.
The road being rough and him not well,
He lost his way and he went... to...
Hopalong Peter, where you going (x2)
Hopalong Peter, won't you bear in mind
I ain't coming back till the gooseberry time. - RBW