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an object or person that is of nuisance or an irritant, yet can't be easily rid of.
His neighbor asked him to watch the dog over the weekend, which turned out to be quite a portnoy.

A: "I started seeing this girl but I don't really like her, and now she won't leave me alone."
B: "You need to ditch that portnoy right now."
by The Count of Tuscany September 04, 2011
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