me cayó el 20

Spanish Mexico

Expression USED On Occasion BY Everybody

It is a phrased used to illustrate when you finally understand something. The origin dates back to when all public phones used to charge 20 cents per call, so when the call was conected, you 20c coin would drop, and your call would connect.

"Me acaba de caer el 20 que mi tío John es 10 años mayor que mi tía Jane."

"I just realized that uncle John is 10 years older than aunt Jane."