A flabby upper arm that jiggles when you raise it and move it around, not unlike the arm of an overweight senior citizen who spends all her free time frantically waving her hand at the bingo table.
"Don't wave while wearing a short-sleeved shirt or people will see that you have a bad case of bingo arm."
by Kate the Grammar Vandal May 01, 2008
Bingo arms contain a mass of flabbage near the armpit. When jarred or jostled, the fat tends to move back and forth in the opposite direction. The excitement of winning BINGO at senior's night will prompt an increase of noticeability of these babies.
"BINGO!!!!" *old lady flaps the fat on her bingo arms around*
by lovelyrita(metermaid) June 28, 2011