The phrase "haddest got to" can be replaced with a variety of synonyms depending on the context in which it is being used. One option would be "must have," which implies a strong obligation or necessity to do something. Another synonym could be "need to," which suggests a requirement or urgency to complete a task or take action. Alternatively, "ought to" conveys a moral or ethical obligation to do what is right or expected. Additionally, "should" implies a recommendation or suggestion that something is beneficial or desirable. Ultimately, the choice of synonym will depend on the tone and intention of the speaker or writer.