Movies
First things first: Where's your shitter? I've got a turtle-head poking out.
— Fat Bastard ‧ Austin Powers: The Spy Who Shagged Me

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
This is a blunt, gross-out arrival line. The speaker skips any greeting and demands the bathroom, using a cartoonish image of a turtle poking its head out to show how urgent it is. The humour is in the crude, exaggerated honesty.
Context reviewed