Dan, actually, that's the flabby skin on the bottoms of their upper arms that a lot of older people have....
I hadn't heard it before. I cracked up when I figured it out...I have a mental image of an old lady yelling "BINGO!" and waving her hand in the air, and whoever's next to her is getting slapped silly by her bingo wings.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.