Many many years ago I had a job as a gas station attendant. Actually I was a truck stop attendant.
This meant that I worked at a truck stop. You know, one of those places where trucks stop to refuel and truckers get to rest.
One night as I was walking among the parked big rigs I noticed some of them had a sticker that read "No Lot Lizards."
Completely ignorant of the issue I asked someone "What's a lot lizard?"
"It's a prostitute. A prostitute that slithers around truck stops," was the reply.
Alrighty then. Lot lizards are truck stop hookers.