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A Rotterdam Casserole is the act of farting under your bedclothes, usually a duvet or something nice and thick, followed by your sticking your head (or your partners) under the sheets to allow the savouring of such a wonderful smell - it also gives your partner a chance to guess what you may have had for lunch :)
Man (to his wife): Have you ever had a rotterdam casserole before?

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!
by AssViper December 08, 2010
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