Worse than a swot, a person who sucks up to teachers, follows all school rules and is maybe not smart, but incredibly hardworking.
To boot, the stew usually has a sneaky or annoying personality.
Usually used in Northern Ireland
See that girl, over there? She does favours for the teachers, has a long skirt and done top button and got 100% in that deadly physics test!
She is such a stew!