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1 definition by JFC3

An unsightly glob of fat between the elbow and armpit which exists in lieu of a tricep. This jiggly extra addition to the anatomy is found exclusively on moms or grandmas. The Bingo-Wing is most noticeable when waving or yelling Bingo! at a church picnic.
Grandma: "Thanks for stopping by, we'll see you on your birthday!" (waves good bye)

Brother: "Did you see that Bingo-Wing? It almost knocked grandpas head off!"
by JFC3 June 20, 2011