(person)A rather large and unpleasant looking human being who spends all their time sitting in their yard, determined to catch those meddling kids in the act. Every neighborhood has one. It is quite possible that if there are meddling kids, the Lawn Creep may intend to EAT them as punishment.
Every day I drive down the street I see the lawn creep hanging out in a chair with a Big Gulp cup and the same dirty v neck shirt. I think it saw foot prints in its lawn and is determined to catch the kids responsible for it