What inmates in jail shout out to other inmates to alert them that a corrections officer (c.o) is walking around close by checking for contraband or illicit activities.
Joker hid the stash when he heard someone yell out "man walking".
An exclamation warning people in prison that an inmate who is on death row is walking by and caution should be taken since they wouldn't hesitate to kill someone, seeing as they are already dead.
Guard: Dead man walking!
Inmate: AHH! Where is my teddy?!?!!1!
An employee who has given two weeks notice and is liable to cause all sorts of trouble for the business.
"Johnny is supposed to work tonight but he's a dead man walking so who knows. If he does show watch him like a hawk, and make sure he's not poaching our staff.
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.