Underwater Hygienist

A fancy way of calling a stay at home mom giving her child a bath.

Fred - "Hey Sarah, sorry my wife can't talk on the phone right now. She's busy with her new job as a Underwater Hygienist."
Sarah - "I thought she was staying home raising the new baby?"
Fred - "She is. She's giving the baby a bath right now"
Sarah - " you're an ass, haha"