Strangely enough, koala is slang for the alcoholic beverage absinthe. It originated as just a cover up word for alcohol in general.
Underage kids talking about getting some 'koala' so anybody who listens in, parents or otherwise, won't understand.
Berta: Hey Jimmy! Let's get some koala!
Jimmy: Bitch, last time we did that my mum smelled it on my clothes and beat me with a chair.
Berta: So what. STFU.
Jimmy: Shut yo' mouth hoe, or I pull a jinga out and stab ya.
Berta: Yo mama so fat.
Jimmy's Mom: You called me fat?
*Eats Berta*
A person who will not help themselves; Similar to that of the marsupial known as a koala who spends its time eating poisonous leaves so that they must sleep the majority of the day.
A person in their late 30’s or older, who did not have any sport affiliations to a team, did not support nor cheer for a team until that team showed promise to win a championship.
Rhys is a koala. He just started to support Liverpuke after they win the semis in the CL.