Yard Open
A prison term called out by inmates to indicate the area is free of guards and to proceed with passing contraband or delivering messages. It is also something to call out when someone bends over to indicate a bootyhole is open for business.
"Ay, can I get a yard check? Any 12 out there? -Nah, yard's open man."
"Damn, dropped my soap. -YARD OPEN!"
"Damn, dropped my soap. -YARD OPEN!"