Definitions

1. interjection

a sudden exhalation of breath, often expressing contempt or disgust

“He let out a loud piff as he saw the dirty dishes.”

2. verb

to breathe out quickly, often with a hissing sound

“The pipe puffed out a small cloud of smoke when lit.”

3. noun

a sudden outburst of breath, or a small cloud of smoke from a pipe

“The piff from the pipe was visible in the dim light.”

4. slang

something that is considered unimportant or worthless

“The new movie was just a piff compared to the last blockbuster.”