Here are the possible solutions for they're scanned when checking out clue
Answer
Clue
Relevancy
barcodes
Clue
They're scanned when checking out
Definition
BARCODE, an arrangement, readable by computer, of thick and thin parallel lines, e.g. printed on, and giving coded details of, goods at a point of sale, library books, etc.
moet
Clue
"The ___ and Alize keep me pissy / Girls used to diss me / Now they write letters 'cause they miss me" (Notorious B.I.G. lyric name-checking his fancy champagne diet)
horizons
Clue
They're frequently scanned
Definition
HORIZON, the line where earth and sky seem to meet
qrcodes
Clue
They're scanned in e-commerce
upcs
Clue
They're scanned in mkts.
counterplotz
Clue
Passing out while checking out?
amy
Clue
Tan that might be scanned on the beach
barcode
Clue
Scanned lines
Definition
an arrangement, readable by computer, of thick and thin parallel lines, e.g. printed on, and giving coded details of, goods at a point of sale, library books, etc.
