Green’s Dictionary of Slang

banged up adj.4

[bang v.1 (2a)]

(N.Z.) pregnant.

[UK]D. Powis Signs of Crime 172: banged-up [...] for a female—pregnant.
[Aus]Macquarie Dict. 173/1: banged up [...] pregnant [Simes:DLSS].
[Aus]Sydney Morn. Herald 9 Dec. Guide 27/2: She find herself banged up by her boyfriend, Guy, a mechanic, who promptly leaves [Simes:DLSS].
[NZ] McGill Reed Dict. of N.Z. Sl.
[Aus]L. Redhead Thrill City [ebook] Know all about your friend Chloe, the banged-up slapper.