When one fellates his/her partner and makes use of both hands, one stroking gently on the balls, the other stroking the shaft of the penis. While the mouth is also sucking the cock at whatever speed the male deem necessary, thus causing a Triple Threat. This normally causes the male to ejaculate very quickly, no matter how many times he has received the Triple Threat in the past.
Dude, Emily totally came by on my lunch break today, and hit me up with that TRIPLE THREAT!!!!