When a group of mates gather in a circle each facing the same way around the circle, front to back, drop down to a crouch, and shove an ecstasy tablet up the arse of the person in front. Then when all the pills are shelved, turn into the middle of the circle, touch fingers and say "E.T. Phone Home!"
"Me and Lockie had some mates around last night for a Port Lincoln Crop Circle. It was pretty Loose ay"
When one person (typically male) elects to get naked and have a group of (also naked) women stand around them in a circle while they pass thier flatulent gasses in said individual's general direction for the soul purpose of sexual fulfillment.
Friend #1: "Hey Mikey, you gonna make it out for my bar mitzvah next weekend?"
Friend #2 "Sorry bro I can't make it. I'm hiring a bunch of overweight prostitutes to give me a Carolina crop circle that weekend!"
The pattern left on a lawn after a dead project car is resurrected or sold. Normally dirt in the middle with longer grass around the outside where the mower can’t reach.
“Did you see the Bogan Crop Circle on Neil’s lawn? Looks like he sold the piece of shit."