n. An affliction affecting mostly the male of the human species (though other species have yet to be studied for this problem), in which the male loses all sense of logic and reason when given the opportunity to have sex; see vagina. When this is revealed to be only the ILLUSION of the opportunity to have sex, the male is often ridiculed and punished by friends; see stupidity.
Can be compounded in severity when the name of the illusion's creator begins with a "V", e.g.. Veronica.
Kevin gave that psychobitch cocktease, Veronica, keys to his apartment. Obviously, he's suffering from a severe case of Vupidity.