A routine
send-off. The origin is from the airlines,
when the flight ended, and stewardesses bade farewell to planeloads of passengers as they filed out.
Passenger 1: "Enjoyed the flight."
Stewardess: "Buh
bye."
Passenger 2: "See you
next trip."
Stewardess: "Buh
bye."
Passenger 3: ""Bye now."
Stewardess: "Buh bye, buh bye, buh bye, buh bye...."