to act drunk when you are not; trying to fit in with the crowd and make yourself look cool when really it makes you look like a huge loser; common occurence among designated drivers.
Person 1: "hey man, what are you drinkin tonight?"
Person 2: "nothin, i'm gonna ling it"
Person 3: "wow, that guy is real drunk!"
Person 1: "naw man, he hasn't drank anything tonight....he's linging"
Person 3: "ohh....dude you're such a linger!"
a year later....
Person 3: "dude, remember that time you lung??"