I would assume that and "ET" is to Earthlings as an "EK" would be to you.

As to trailer parks...

trailer parks are the center of the universe for:

Maury Povich and Jerry Springer watchers
Howard Stern listeners
Tornados
Tall hair
Prison tattoos
UFO 's'ficianado's (see Gary Burbank)
Monster trucks
Gravy-on-everything cuisine