A high pitched whistle emitted from the penile hole after heavy petting and general gental gentile strokes or sucks on the weinke. May or may not sound like a train or teapot depending on the size of the specimen. Could cause blindness in people within 1 mile area.
Ben: Do you hear that?
Laky: Sounds like a Boner Whistle in the distance.
Josh: I'M BLIND!