whoof exclamation 2verb 2forms 3 exclamation2 •The sound of a dog barking. •The sound of a steam train, steam boat, etc.Whoof! whoof! its steaming breath hissed at her. — 1902 verb2 •To make sound like a dog's bark; to bark. •To make a snuffling noise, like a bear vocalising, or a steam engine puffing.He kicked Leo in the ribs to wake him up. Leo grunted and whoofed. — 1980 formswhoofed · whoofing · whoofs