The sexual act of wrapping your legs and arms around your partner, thus having them support your weight, while engaging in intercourse. Traditionally done by women; however, if your girl is much larger/taller than you or really strong, you can Koala her from behind while she stands or leans over. Another rendition is accomplished by wrapping one leg around your partner and grasping the back of their head while receiving a blow Job.
A physically attractive girl who has no control over her emotions and becomes easily attached. A koala latches on, sucking the life out of the man she has latched to, and eventually leaves them out to dry in the dirt.
I don't know if I want to be talking to Natalia, I heard she's a koala.