As Tallis climbed out of the car, chuffing windily into the kerchief, MacMaine snapped an order to the sergeant behind the wheel.
He sits there, muttering and chuffing and sticking a long wood spit in his soup, and then he coughs and says 'Ug!'
"pleased, happy," c.1860, British dialect, from obsolete chuff "swollen with fat" (1520s). A second British dialectal chuff has an opposite meaning, "displeased, gruff" (1832), from chuff "rude fellow," or, as Johnson has it, "a coarse, fat-headed, blunt clown" (mid-15c.), of unknown origin. Related: Chuffed.