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

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×