Top Definition
When one enters a grocery store in the pursuit of making a meal out of all the samples around the store. A strong indicator of a cheap ass.
John got kicked out of Safeway for having a Costco Lunch in the Deli section.
by Captain Headbutt October 27, 2007
going to the store Costco with no intention of buying anything, except to walk around and eat all the free samples
#1: Dude, the other day I forgot my money at home so I had to eat a Costo Lunch.

#2: The other day I had to sneak around Costco stealing free samples, making sure the people didn't recognize me...what a Costco Lunch!
by cooooooooooooolbeans June 02, 2010
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