lacks adequate funds (seems to be a Brit or Aus term). Same as StoneBroke in the US.
Googled most frequently in other online dictionaries, but typical usage could be, "Ppl who are stony broke rarely get the chance to post 'stony broke' on the net." :-)
"my brokeback" is used by men who typically identify as straight to refer to another straight identified man that he's close with or really likes, as in "If I were gay, I'd go for him."