bang up verb 3adjective 2forms 5 verb3 •(informal) To damage.He banged up his new car last night. •(informal) To put someone in prison, or into their individual cell.He was so drunk that the police banged him up for the night. •(slang) To inject a recreational drug.I knew some fellows who banged up, I mean heroin, but I kind of stayed away from it. — 1971 adjective2 •Good, superior, excellent.He's doing a bang up job. •(informal) Especially good; wonderful; superb.[…] he had dined with the Hickses ("a bang-up show -- they're really lances-you wouldn't know them!"), and had met there Lansing […] — 1922 formsbanged up · banging up · bangs up · more bang-up · most bang-up