The phrase "doeth bangup job" is an archaic and outdated form of English that is rarely used today. The word "doeth" is spelled phonetically as /dʌθ/ and is the third-person singular present tense form of the verb "do" in Middle English. "Bangup" is spelled phonetically as /ˈbæŋʌp/ and means "excellent" or "impressive." "Job" is phonetically spelled as /dʒɒb/ and refers to a task or work that needs to be completed. Together, the phrase means "he/she/it does an excellent job."