Green’s Dictionary of Slang

bang up v.1

[bang v.1 (6a) + SE up]

to inject a narcotic drug.

1926
193019401950196019701980199020002010
2012
[US]J. Black You Can’t Win (2000) 134: You’re in with what ‘gow’ I’ve got. Let’s bang it up before they come and take it away from us.
[US](con. 1966) J. Carroll The Basketball Diaries 138: I had just come out of the bathroom after banging up when our shithead third partner walked in.
[Aus]L. Davies Candy 4: She watched me bang up a few times.
[UK]M. Manning Get Your Cock Out 41: Mincey pardoned himself and banged himself up in his left eyeball.
[Scot](con. 1980s) I. Welsh Skagboys 59: Iver done the skag before? [...] Ah mean, banged up?