When your gf has long ass fingernails and scratches up your cock just before sucking you off
"Wtf my girlfriend gave me a sexy koala. Now I have to go see the doctor."
Catching chlamydia from a prostitute.
Man, I paid for a girl last night and ended up with a koala casserole.
Koala Cafe is a restaurant with ugly ass 6 year olds with slow management
a piece of Kangaroo meat cut into the shape of "piss flaps" and then tried to be fed to the naive English Pommy
"Here mate would you like to try some BBQ'd Koala flaps"