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1. To hurt someone or damage something as a result of physical contact. A noun or pronoun can be used between "bang" and "up." That accident banged up the passenger side door of my car. I got really banged up in that car accident.
2. To deal a blow the integrity or value of someone or something. A noun or pronoun can be used between "bang" and "up." The incident certainly banged up the company's reputation. It banged my pride up a bit to be rejected like that.
3. adjective Very good or outstanding. Used primarily before nouns, especially in the phrase "bang up job." Often hyphenated. Considering his young age and small stature, Billy really did a bang up job building the dog house for his new puppy. I want you to write a really bang-up article for the Sunday paper.
mod. really excellent. I like to throw a bang-up party once or twice a year.