I never thought of doing this. There are quite a few different meanings of the word in that dictionary that I had never heard of. Thanks for sharing this one.
I kind of thought that bingo had been an established game, and that people saying "Bingo!" when they had something sussed out, etc., stemmed from the game. You learn something new every day!
I thought I was the only one that has used the word Bingo when I , when I found an answer to something. I never realized that it was actually the definition for the word Bingo. Now I won't feel stupid saying it aloud anymore.