What is Big Girls Blouse?
1.
A lightweight. A heaving jessy. A right girl. (Generally applied to blokes.)
He did not want to have a strong pint of bear. Instead ordered a strawberry frappuccino. "What a big girls blouse!"
2.
someone who is grown up but is terrified of certain things, e.g spiders, aeroplanes, the dark
He is some big girls blouse, a spider ran up his leg and he nearly shit on himself.