It means working underwater.

Take another crack at it, Holly. I don't mean to be cynical, but money is… Whiskey with a little water if you don't… And uncouple this shifting rod. I'm in for a going over when I get back… The sky's the limit. Thank you. Frank is free to go out with whoever he… Go ahead, say it. But you turned right, darling. Whatever you say. Ten years. But if it ain't? What do you think you could do for me? How about a nice friendly push?