Green’s Dictionary of Slang

to inject a narcotic drug.

1926		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.
1997		L. Davies Candy 4: She watched me bang up a few times.
2000		M. Manning Get Your Cock Out 41: Mincey pardoned himself and banged himself up in his left eyeball.
2012		(con. 1980s) I. Welsh Skagboys 59: Iver done the skag before? [...] Ah mean, banged up?