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a euphemism, used to fill gaps in conversation, awkward silence or just for a laugh. Coined by Master Chef Hugh Acheson, loosely referring to a scallop stored in a tin the size of a paint can.
Girl 1: Smart, handsome, he is quite a catch.
Girl 2: ... AND he has an unusually large scallop...

Wife: Have you cleaned the garage yet?
Husband: Have I mentioned I have an unusually large scallop?
by Capt. Colicchio April 12, 2011