A variation of a bear fight. The koala bear fight is performed by consuming a traditional bear fight (a Irish Car Bomb and a Jagerbomb consumed in rapid succession), followed by quickly drinking a can of Fosters.
Person 1: Hey mate, want to go get a round of koala bear fights?
A sex position perfected by the Aussies, the Backwards Koala Bear involves a fursuit and lots of eucalyptus leaves. One must also speak only in an Australian accent until orgasm is achieved.