I. ˈchəf noun
Etymology: Middle English chuffe
Date: 15th century
: boor , churl
II. intransitive verb
Etymology: imitative
Date: 1914
: to produce noisy exhaust or exhalations : proceed or operate with chuffs
the chuff ing and snorting of switch engines — Paul Gallico
III. noun
Date: 1915
: the sound of noisy exhaust or exhalations