The mint test is administered immediately before trying to take a
girl home. If you're not sure if a gal wants to get down, ask her if she'd like a mint. If she's into you she'll want to make sure her breath is
fresh before anything happens. If she passes the mint test ask her back to your place. If not, get her number and good luck.
This all assumes that both parties haven't already started making out at the bar with
nasty cigarette and booze breath.
Guy 1: You look like you're about to pull with that
girl. You up for another
round or you giving her the mint test?
Guy 2: Mint test!
Him: Mint?
Her: Yes, please.
Him: Lets go back to my place and
hang out.
Her: mmmkay