It is when a girl is on her rag and is using a tampon.  It can only occur in hot temperatures or in a heavy workout.  The girl experiences a whistling teapot when the heat causes her vagina to steam thus making her vagina boil over and produce a slight whistle.  The tampon acts as the teabag in the analogy.
by OJ is not guilty September 6, 2007
Get the Whistling Teapotmug.