Green’s Dictionary of Slang

(S.Afr. gay) handcuffs; thus by meton., a policeman.

2003		K. Cage Gayle 57/2: Betty Bangles n. 1. handcuffs 2. policeman.
2005		Laurie & Evans Outlines 56: ‘I don’t need Betty Bangles in my life right now’ [Simes:DLSS].