1. FLUMMOX, V. ******************************************************************************** colloq. or vulgar. 1. trans. To bring to confusion; to `do for', cause to fail; to confound, bewilder, nonplus. 2. U.S. colloq. To `do up'. 3. intr. U.S. To give in, give up, collapse. Hence {sm}flummox n. (see quot.).