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1. A bittersweet longing for an ex-boyfriend, and more specifically his penis; a sentimental yearning for the happiness and sexual adventures shared with a former boyfriend.
I had a total case of penostalgia last night, so I drunk-dialled Stefan!

Oh, I'm so down about not seeing Dave anymore, all I can think about is him and the sex we had. I think I have penostalgia.
by KaliB25 April 09, 2011
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