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1.
Any international flight in which there are more male flight attendants than female. A Sausage Casserole differs to a sausagefest due to chutney being involved.
Mike: "Damn, there are only 3 female flight attendants on this flight! It's a total sausagefest up in here."

Cam: "More like a Sausage Casserole."
by nevelis April 05, 2011
 
2.
When a person has more than one penis in any orifice for an extended period of time. See gangbang
See Debbie does Dallas for examples of "Sausage Casserole".
by cheeseontom February 18, 2014