late 14c., from O.Fr. fum "smoke, steam, vapor," from L. fumus "smoke" (v.), from PIE *dhumo- (cf. Skt. dhumah, O.C.S. dymu, Lith. dumai, O.Prus. dumis "smoke," M.Ir. dumacha "fog," Gk. thymos "spirit, mind, soul"). The verb is first recorded c.1400, from O.Fr. fumer, from L. fumare "to smoke, steam;" figurative sense of "show anger" is first recorded 1520s. Related: Fumed; fuming.