Definitions by Nosredna Ekul

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