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an amalgamation of Beyonce, the lyrics "I slay" from her song Formation, and the urban meaning of the word 'slay' to denote an amazing achievement or success; originally coined by the BeyHive as a celebratory title for Beyonce and her success. Slayonce is another term of the same derivative.
She came to BeyonSLAY that Formation performance. Yaaas!
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by Kray Zaay October 12, 2016
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