(QBT) Usually performed during cunnilingus. When one partner will blow a quick, forced breath directly into the vagina. Then firmly push on the mons and a queef pops out. Serves almost no purpose but a good laugh or a quick way to ensure you won't have another date.
(1) Jim had to end the date with Sally before he hung himself in her bathroom, so he gave her a QBT followed with a look of shame. (2) Beula was asking Willy for a little more excitement in the sack so Willy tried the queefblow test. Did that work?