Errr ... G'day sarah101,

Well no! Hrothgar's posting, 7 postings up, is the correct published text:
Words and music by Neil McBeath and Claude McGlynn.
© 1919 Francis, Day and Hunter Ltd
...
And when I'm back again in Yarrawonga
I'll soon be stronger than old Mahonga,
...
Of course, we don't know who the heck "Old Mahonga" was - and I can't really ask Neil McBeath or Claude McGlynn … however, it is the name of a hill and a stream in (modern) Zimbabwe - and appears as a (usually African) surname. There are also several examples of Mahonga Streets in Australian towns, such as:
Jerilderie, Victoria,
Condobolin, New South Wales
Rowville, Melbourne, Victoria, and
Tahmoor, NSW.

I guess appearance as a street name in Australia suggests that there is a chance that someone of the name Mahonga was famous at the time - perhaps a boxer or weightlifter - or else in some military context … but, if that were so, they are too early - or insufficiently famous - to show up in the usual searches.

Regards,

Bob