Billy " Oh and wah sure it only took me liek a 10 years to grow!"
From the black and white vertical strips that supermarkets put on products so that when you get to the checkout, you or the checkout man/girl/person can put it under the optical scanner, and the supermarket's software will update its database, and the cash register will put it on your bill.
Said jerseys somewhat resemble the machine-readable product ID printed on retail packaging (hence "barcode") - though the shirts worn by NFL referees are a closer match.
Guy2: Yeah, I saw. What's his main account's name?
Guy1: Nobody knows man. There's lots of barcodes now that there's a tournament coming up.