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.
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.
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.