Using two condoms and putting heat cream in between.
Guy: Johnny hooked up with her last night.
Friend: It's OK, I'll just Fire Bag it.
Guy: What's that?
Friend: Double bag it with heat cream in between. If one breaks, you'll know about it.
1. A finite amount of narcotics.
"You could smoke a fire bag yeah, of grass yeah."
Juvenile - "Back That Thang Up."