The phrase "hast it over" can be spelled as /hæst ɪt ˈoʊvər/, and is an old-fashioned way of saying "finish it quickly". The word "hast" is from Middle English, meaning "to hurry" or "to hasten". It is conjugated in the second person singular present tense, meaning "you hurry/you hasten". The word "it" is a pronoun referring to the object of the action. And "over" means "completely finished". So, "hast it over" means "hurry up and finish it completely".