Yes "Where are my pants" is a line out of the version of "All for me Grog" that my husband learned in England I think. I'll take a look at the data base version and see how it compares with it.
That verse starts:

Where are me pants, me noggin noggin pants
All for me beer and tobacco....

I'll get back. The verse about his bed is the best.
... lent it to a whore and the mattress is all tore ...