It's from a very old British TV series called ".. 'ello 'ello .. "

It's set in WW2 France and there is an English spy posing as a gendarme. His French is tangled up English. So, for instance, he would say:

"Good moaning .. 'ow is your feather's dag. It has very bog arse".
Meaning, "Good morning .. how is your father's dog. It has very big ears"

Does this explain? lol

It's a Brit thing :D