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In Spanish, used when referring something that happened a long time ago.

Could be a shortening of "Ya llovió mucho desde entonces" (Lit. "Has rained a lot since then"/many years have passed since)

Might describe nostalgia, since tears could look like rain water.
"I watched that show many years ago... (starts crying) ...Ya llovió"
by tamalesyatole November 30, 2011