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A contraction of "seriously" and "really" either used emphasize or reengage in seriousness, as an exclamation, ironically or humorously. It is spelled many ways, often quizzically in a way that doesn't even include the letters used for "serious" and "really". The word goes back to the 80's but has remained popular and experienced an upsurge in texting and online writing as well as in informal speech.
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