for⋅bid⋅den fer-bid-n, fawr- swan swon

A sex act of either mutual or sole discretion in which a copulating couple of any sexual orientation lock the door to the room in which they participate in intercourse, forbidding a swan from entering the room.
Person A:"What's that bird doing sitting outside that door?"
Person B: "Ah, someone's in the middle of doing the forbidden swan! dirty bastards."
by heavenslust September 14, 2009

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