A snot whistle is the whistling sound created when the nasal cavity can let only a small amount of air through the nostrils, thus creating an aerophone.
John: Is someone whistling quietly?
Bill: Nah, man. I've had a cold all week and now I have snot whistle.
Bill: Nah, man. I've had a cold all week and now I have snot whistle.
by Jimbo Jimmy James December 14, 2009