Wiktionary
n. (alternative spelling of woof English) vb. (context intransitive English) To make a snuffling noise, like a bear or a steam engine.
Usage examples of "whoof".
White steam whoofed up, but she jerked her head back before it could get on her face.
The bullets noisily punched through the machine, and the engine whoofed into flames.
Africa is still far away, but here we must say farewell to the friendly breast of Mother Earth, for from now on we sail without sight of land amid the streams of tunnyfish and the whoofs of dolphins.
The bullets noisily punched through the machine, and the engine whoofed into flames.
The bottle hit directly in front, the mixture whoofing into a huge fireball.
Where its gaze touched the great crowns of trees, the lush summer foliage simply whoofed into sheets of fire, like a sequence of torches set alight, and birds burst from the woods in a flurry of wings and flocked in panic toward the cliffs.