A lunch time holiday celebrating salsa and Paul Newman.

Mexicanaco Day is always celebrated with Tostitos, Paul Newmans Own Black Bean Salsa, a bowl, and friends.

It started when a bunch of high school friends who all decided that tomorrow they wanted Salsa. Eventually the tradition grew into a fiesta celebrating salsa at lunch time.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.