luftwaft

The floating odor found on an airplane, typically the odor emanating from the lavatories shortly after the dinner course served on a long flight.

Origin:
German: Luft, air (from Middle High German, from Old High German) + Waft

Kevin: I don't like sitting in the last five rows of the airplane.
Chris: Why not?
Kevin: The luftwaftage from the toilets can get pretty bad.