Originally inspired by the name of a sandwich, a Hartford Grinder is pretty much anything dirty you can imagine
"He gave her the ol' hartford grinder".
"She looks like she's been through the hartford grinder a few times."
"I'm gonna do a few hartford grinders on myself before that date."
A major or minor car accident occurring in the city of Glendale. As the term insinuates, such accidents are a disturbingly common occurrence in the city- to such an extent that locals no longer turn their heads or phone the police when pedestrians are turned into pancakes by imported sedans (typically black or white in color.)
Background: Glendale, California is known for having the highest number of car accidents per population in the United States.
Someone gave James The Glendale Hello on the way to work today. The insurance company might total his Honda.