A female anus, clinched vigurously, when releasing gas echos the high pitched sound of a squeeky whisle. It can only be faintly heard during occurence. This action is usually associated with and during social settings, the attempt is to not receive blame or embarrasment for said act.
At the Anderson's cocktail party, only fluffy the cocker spanial noticed the high pitch sound of Janet's dirt whistle. psssss..... "oups I've done it agian."