The Brumbies are a rugby team from Canberra, Australia.
Brumby is an Australian word meaning a wild horse.
It should not be confused with
DOUBLE BASS:
A sexual position in which the man enters the woman from behind, and then fiddles with the woman's nipples with one hand and her Budgie's tongue with the other. The position is similar to that used when playing the double bass instrument, but the sound produced is slightly different.