A phrase I use all the time is Holler when you're ready or Holler if you need me. I don't think anything of it til I wrote it on the board and I thought boy they must really think I am a hick! Ok A hick who lives in the sticks!! someone who is backwards(doesn't know much) and lives out in the far back regions and doesn't have much contact with the civilized world! Iowa has this stigma that everyone who lives in Iowa is a hick. No brains and no manners.
Another version of the holler is-- It's just a hoot and a holler away.