A smooth brained creature with little intellectual understanding.
Often used as an insult for people with bright stupid ideas that somehow work.
"Yow! That's a koala moment right there."
"If it works, then it is a koala."
Someone that just makes you light up inside, and is so adorable that your heart melts. Someone that she. You see them your stomach gets butterflies, and does flips and you just turn into the definition of joy. The feeling can't be described, it just happens.
Madison is MY lil koala bear
somebody who is really really really dumb
person 1: get ot of here you koala brain
person 2: shut up nerd
A cooter with some funky shtuff up there.
This girl got a koala's vagina