Top Definition
The commonly held suburban delusion that you really will buy just that one thing at Costco.
Sorry honey, I planned to just buy socks, but I fell ill with Costcosis and ended up buying a new jacket, vaccuum cleaner, food processor, and TV.
by TR_UD March 01, 2014
1 more definition
10 Words related to Costcosis
A condition in which a Costco shopper on a random shopping trip will purchase bulk items not needed but are blinded by the deal despite the large quantity that will not be used.
Witness: "That guy must be suffering from Costcosis. His cart has a 3-pack of 20lb tubs of mayo."
Person suffering from Costcosis: "That's a good price for a 3-pack of 20lb tubs of mayo."
by Bryan John February 02, 2011

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