look up any word, like bae:
 
1.
Firefighter personnel on scene of any non-specific emergency scene who's sole purpose is to give one the illusion of somewhat importance. Yard Walkers tend to appear busy, and almost always are communicating with some unknown entity via hand held radio. The Yard Walker's most difficult job is to answer any relevant question about the patient when asked by EMS personnel. A Yard Walker is the visual stereotype of your friendly neighborhood hero....the Firefighter. No matter how well they play it off, it's best to acknowledge their "importance" and thank them for their service.
" Dispatch to ambulance unit responding, be advised there is one patient. 5 yard walkers are on scene as well."

"Dad, look at all the firemen working in that yard!

No. Those, my son, are yard walkers."
by TideEMT20 March 11, 2013