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When a person says or does something with complete sincerity, only to have no recollection of it at a later date.
Boy: "Girl, I wanna be wit ya."
Same boy, one month later: "WADDAFUCKIZUPWITDATDURTYSKANK?!"
Girl: "Geeze, look at you wit yo temporary sincerity!"
by rstlne11 April 01, 2011