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much like ano del caldo, (year of the stew) this term also describes something or someone who is outdated and really needs a serious make-over. Literally means "year of the slap." (Implying, no one knows or remembers when exactly was the year of the slap because it was so long ago.)
"Mom have you seen this movie before, I think it's pretty old..."

"MMM, that's from el ano de la cachetada...."
by MintyLeila June 19, 2005