To flip a coin with someone in order to decide or determine who gets to have or do something. A name or personal pronoun can be used between "toss" and "for." We both wanted to go with him to the concert, so we decided to toss for it. A: "No, it's your turn to do the dishes." B: "Aw, come on, I'll toss you for it!" There's only one chocolate bar left, so let's toss for it.