tart

Short definition from Wiktionary

Adjective

1. 1
   Sharp to the taste; acid; sour.
2. 2
   high or too high in acidity.
3. 3
   Sharp; keen; severe.

Noun

1. 1
   A type of small open pie, or piece of pastry, now typically containing jelly (US) / jam (UK) or conserve, or sometimes other fillings (chocolate, custard, egg, butter, historically even meat or other savory fillings).
2. 2
   A melt (block of wax for use in a tart burner).
3. 3
   A prostitute.
4. 4
   Any woman with loose sexual morals.

Verb

1. 1
   To practice prostitution.
2. 2
   To practice promiscuous sex.
3. 3
   To dress garishly, ostentatiously, whorishly, or sluttily.

Proper noun

1. 1
   A surname.