sab, I don't think you're an "unemployed bum" - if people ask just say "I have a DD who keeps me pretty busy". SAHMs still have to drop child/ren off, pack lunches, clean up after them, sports days, birthday parties, dinners, breakfasts etc.
Problem is, it's incredibly hard to find part-time work (when I searched anyway) and getting it is an issue as there's less positions.
SO you're considered a "lazy bum" if you stay at home while your little ones are at school OR you can work full-time and be completely burnt out by the end of the day and have less time.
You can't win!