Well you could dare someone to put their top/bra over their head and run down the road yelling 'I like chicken tonight, chicken tonight!' (my twin sister had to do that).
What Are Really Bad Dares For Girls?
Wear your bra on outside of clothing
The worst ever dare you could ask a girl to do would be something to do with boys. But it depends on the girl. If they are just not into boys at all then you'd have to think hard about what they would really NOT LIKE to do.
A bad dare would be to shave a leg
Do you mean bad as in like plain terrible or bad as in like a 'naughty' dare?