A Rotterdam Casserole is the act of farting under your
bedclothes, usually a duvet or something nice and thick, followed by your
head (or your
partners) under the sheets to allow the savouring
a wonderful smell - it also
partner a chance to guess what you may have had for lunch
Man (to his wife): Have
you ever had a rotterdam casserole
Wife: No, what's it like?
Man: Here, I'll make you one... (Farts loudly under the duvet and lifts it up over his wife's head)
Wife: Oh, you dirty bastard!