Possible Etymology: Having attended an elegant BSO concert the day before, the felicitous R Carroll hit upon the phrase while attempting to describe to his friends an experience enabled by Twitter.
Fellatiostomy is the act of fellatio provided by a person who has a tracheostomy. The benefit of a fellatiostomy is that the "giver" does not ever need to stop to breath. The danger is associated with "ball-valving" where the scrotum intermittently obstructs the tracheostomy causing suffocation.