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When a person is embarrassed or does not want to be seen buying something in public, so they buy one or more things to cover up that purchase.
"Dude, why do you have this car magazine and teen life?"
"It was my cover buy when I bought this month's issue of hustler.."

"Why did you get new shampoo and a razor? The old ones are fine!" "I had to buy another 30-pack of extra large tampons so I used it as my cover buy.."
by Ghost-faced thriller June 04, 2009
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