smiling bitch 

A rude, nasty, verbally aggressive person (usually a woman but not always) who makes snide comments through a fake, neocortex smile.

Normal Person: I talked to someone at the baggage claim who said that they would have my bag ready within four hours.

Smiling Bitch: Oh. Well, I guess that they must have been wrong.

Normal Personal: Why are you smiling?

Smiling bitch: Because I'm not just a bitch, hon, I'm a smiling bitch.

smiling bitch by AYYFRON January 27, 2011

smiling bitch face 

The face you make when you are smiling at someone while imagining all manner of death and unpleasantness happening to that person

Mary put on her best smiling bitch face while in a meeting with her rude coworkers.

smiling bitch face by Zonchar February 23, 2021