The correct spelling for the phrase "hast bad time" is actually "have a bad time." The mistake may have occurred due to the similarity in sound between "hast" and "have." "Hast" is an archaic form of the verb "have," which means "to possess or own." The correct pronunciation of "have a bad time" is [hæv ə bæd taɪm], with the stress falling on the first syllable of both "have" and "bad."