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It is when you have a longing for a future event or prospects. As opposed to nostalgia, which refers to the past and your 'nose', this refers to a certain or possible future and your 'ass'.
Is that how my girl is gonna look like ten years from now? OMFG, she will be gross!!" "Don't have an asstalgia so soon. She is already so gross.
by RisavKarna69 August 03, 2010
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