Chuck1  —v. 1 colloq. Fling or throw carelessly or casually. 2 (often foll. By in, up) colloq. Give up; reject. 3 touch playfully, esp. Under the chin. —n. 1 playful touch under the chin. 2 toss. the chuck slang dismissal; rejection. Chuck out colloq. 1 expel (a person) from a gathering etc. 2 get rid of, discard. [perhaps from french chuquer knock]