an open pastry case containing a sweet or savoury filling

an apple tart

a woman who dresses or behaves in a way that is considered tasteless and sexually provocative

she wears skirts this short all the time—she's such a tart

a prostitute

the tarts were touting for trade

dress or make oneself up in order to look attractive

I tarted myself up for the night

behave in a provocative or flamboyant way (typically used of a woman)

she tarted around the room in one of Georgie's dresses

sharp or acid in taste

a tart apple