The spelling of the word "haddest to go" might seem confusing, but it is actually a combination of two words: "haddest" and "to-go". "Haddest" is an archaic form of the word "had" and is pronounced as "ˈhædɪst" in IPA phonetic transcription. "To-go" is a hyphenated phrase that indicates something is meant for takeaway, and is pronounced as "təˈɡoʊ". So, when combined, "haddest to-go" means something you had to take away in the past.