Bye-bye arm 

When one waves hello or goodbye, the fat on their arm may appear to flap in a waving matter as well. Most commonly seen on obese people and mothers.

Soccer mom: "Have fun at soccer, Jimmy! I love you!"

Jimmy: "Okay mom, I love you too!"

Friends: "Man. Jimmy, your mom has some serious bye-bye arm."

Bye-bye arm by Nosredna Ekul August 4, 2009

Bye-Five 

An action performed just as you say goodbye to someone. To perform a high five as you leave, rather than greet somebody. Often performed with a loosely held hand and a relaxed air about the gesture.

"It's been a good day. see you later."
"Yeah man, bye."
(Both Bye-Five before departing)

Bye-Five by Poncelroy June 21, 2011

bye, felicia

An expression used to dismiss someone not worth your time.

"Tyler said if I could give him a ride to the airport, and I was like, "bye, felicia."

bye, felicia by Explaining teen slang February 29, 2016

bye bitch

Way to say both "goodbye" and "love you" at the same time to your BFF.

Me: Bye bitch...see you later!
My BFF: Love you too...see ya.

bye bitch by y.e.v._.13 October 12, 2019

bye now 

When the other party signifies that you have outlived the time they had available for you. A polite but cruel version of "get lost".

bye now

bye now by Nowaste April 4, 2023

Bye bye Singapore 

Bye bye Singapore

Bye bye Singapore

Bye bye Singapore by syafinaz? October 4, 2023

bye bye birdie

Old school for sayonara (Good Bye)

Also the title of a 1960's musical

Biff - "She's 90 days past due on this account"

George - "Give her 30 more days and then its bye bye birdie"

bye bye birdie by chrisking5150 December 3, 2010