When you insert a possum trap into a silicone rubber ass. Then put the ass in a public toilet. When a unsuspecting target goes to insert his penis in sillicon ass, .The possum trap will engage on there penis and there for they will be possum trapped
Dave: hey Mick how was your weekend?
Mick: Not so good Dave, got bloody possum trapped again.
Possum in a sack A girl who acts like a dead fish in bed. Possum(girl playing dead) sack(bed)
I was hooking up with Bobbie Sue McGillicutty the other day, she was a total possum in a sack, she just laid there and did nothing as I was giving her the best 2 minutes of her life.