Usually the recipient states an outlandish or frightening claim designed to garner sympathy or engender fear to convinced another to provide oral stimulation. Examples include claiming to have terminal cancer, or threatening divorce, or claiming that the world will end, or that ones genitals will explode if the act is not completed immediately
Such as: I just found out I have a stage 5 glioma and I'm still a virgin. I just really wanted feel what it was like to get a bj/ have someone go down on me before I die.
Philip K. Dick