Expressive demonstratives (el ... este)

Expressing annoyance

Normally, you place a demonstrative adjective before the noun: este charlatán (this smooth talker).

To express mild annoyance, frustration, or contempt, move the demonstrative after the noun and add a definite article (el, la, los, or las) before it.

Definite article + noun + demonstrative

This charlatan is always inopportune.
El charlatán este siempre es inoportuno.

Gender and number agreement

As always, the article and demonstrative must agree in gender and number with the noun.

This lady is aggressive, and I don't want to deal with her.
La señora esta es agresiva y no quiero lidiar con ella.
These men are shameless; close the door with a slam.
Los hombres estos son unos descarados, cierren la puerta con un portazo.

This structure is incredibly common in spoken Spanish when venting about someone whose behavior is aggressive or just plain annoying.

This salesperson tries to sweet-talk me so that I buy the dinnerware.
El vendedor este me intenta engatusar para que compre la vajilla.
Don't open the door so this smooth talker doesn't get in.
No abran la puerta para que el charlatán este no entre.