"halkaa ho jaanaa" is used for pooping rather than peeing (peeing hardly makes one lighter?). It's kind of figurative (euphemistic?), and just a colourful-ish way to avoid saying pooping. You could use it everywhere except if you are talking to the president of your country (or other too formal situations).I heard this on TV the other day-- maiN halka ho ke aataa huN.
Couldn't quite figure out register. Is it polite? Too polite? Prissy? Totally bog (excuse the pun) standard?
Could I use it both at home as well as with a colleague from work?