pillow pants can be used as a verb or an adjective describing a person.
As an Adjective: A person who on more than one occasion has prevented a sexual act from occurring.
As a Verb: The act of preventing a sexual act from occurring.
The term itself comes from the film, "Clerks 2" in which the pillow pants is a troll living in a
girls vagina that bites off a
guy's penis if he tries to have sex with her before her 21st
birthday.