As we were coming into town our 4yr old says ooooohhh daddy whats that smell? I turned to look at her when our 12yr old said "It's just the smell of society!!!!"
I take it, then, curried cabbage was part of the picnic lunch. 
My kids, on the other hand, were a little more blunt when it's asked: "What's that smell?"
We were watching TV one evening when my daughter (then 11) asked that very question. My son (then 14) promptly answrered: "That's you... your nose is too close to your arse!"
The smell was actually coming from next door... they had fertilised their garden beds with blood and bone, and the pong was permeating the air because it had rained... I already knew this, but who was I to put the mocker on a bit of healthy sibling sarcasm.
