An airline employee who loads and unloads airplanes which are parked on the (airport) ramp.
An industry term, generally unknown to outsiders.
After the aircraft came to a stop at the gate and shut down engines, the rampie chocked the wheels, plugged in the ground power and connected the conditioned air.
Back in the 60's, passing a joint within view of outsiders got the response: "Keep it low", or "Keep it down low (when you pass it)". This usually happened when riding in a car with friends. Over the years "Down low", "Keep it down low" and "Keep it on the down low" generalized into meaning 'keep it secret' or 'don't be obvious'.
(Old School version):
"Hey, keep it low!"
"Pass it low!"
(Laughter from everyone else)
"Keep it down low when you pass it so nobody else can see what you're doing (you dummy)!"
"(Nods head "OK")"
A word which gives much joy to news people, who think they have discovered what to call the hard surface where aircraft park at an airport. The correct term is "ramp".
Upon exiting Marine One and seeing the news cameras rolling, Bush strutted like Ronnie across the tarmac.