Intense publicity for a future event, performed in a showy or excessively dramatic manner suggesting an importance not justified by the event; as, the hype surrounding the superbowl is usually ludicrous.(noun)
source: webster1913
verb (v)
publicize in an exaggerated and often misleading manner(verb.communication)
source: wordnet30
to publicize [e.g. a product or a future event] insistently, in a manner exaggerating the importance of; to promote flamboyantly.(verb)