Stop The Lights Meaning

(Ireland, idiomatic) An interjection expressing exasperation or incredulity. or to illustrate the humour in a situation.

Example: 2003, Stella Feehily Duck, Page 62.
  Sure, stop the lights, I know all about it. There's a great shop in Phibsboro.Transformations' Any size you want.
2003, Ronan Noone, The Lepers of Baile Baiste, Page 57.
  Oh, stop the lights. The Priest is after parkin' across the street. I think he's comin' over here.