Everywhere we go...

Not quite as nice as 'Boomalacka', because it isn't as good at a mixed campfire, but this is another good loud one. Obviously, replace the Forestdale Cub Scouts reference with your own group name. Its weakness is that it forces you to simply build the volume.

Everywhere we go,    (echo)
People always ask us,    (echo)
Who we are,    (echo)
Where we come from,    (echo)
So we tell them,    (echo)
We're the Forestdale Cub Scouts,    (echo)
The mighty, mighty, Forestdale,    (echo)
And if they don't hear us,    (echo)
We shout a little louder...    (echo)

Once you've got the loudest you can, the last verse ends with

And if they don't hear us,    (echo)
They must be deaf.    (echo)