Top Definition
When a bad memory you try to oppress comes rushing back suddenly, and you flinch with the horror of something stupid you did, as if you had been smacked.
slapping self in the face "Aww, man, I just seeing you grill those hot dogs reminded me of something I try to forget-- that time in college I crashed that family reunion. The memory came back and totally Retrosmacked me."
by LatinUB July 13, 2012

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