sharp or acid to the tastesarcastic, bitter, or hurtful A tart temper never mellows with age — Washington Irvingtartly advtartness noun[Old English teart sharp, severe]
a pastry shell or shallow pie containing a sweet or savoury filling [Middle English tarte from early French]
a female prostitutea girl or woman who is or appears to be, e.g. by the clothes she wears, sexually promiscuous woman [prob short for sweetheart]