Top Definition
A condition where a person can not avoid going to Costco in search of a good deal on something, even when the person went to Costco the day before and doesn't even need anything at the moment.
Mark has such a bad case of Costco-itis, that on the way home from work he stopped at Costco to look around eventhough he just shopped there two days ago
by Chunkyc September 19, 2006

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