When a Female/Male does a line of Coke off of a mans penis and then proceeds to give him a blow job.
Often used as the incentive to perform the blow job but not always. If the girl/guy wants to blow them that badly the Coke is just the icing on the cake... or the coke on the dick.
Girl 1: "I can't believe you gave that guy head... at least it was a snow blow"
Girl 2: "Yeah. He was way to ugly... but the Coke seemed to solve that problem"