poser

I hate to see posers showing off.

He has been busy with his SMs during his interview, which in the interviewer's aspect could connotate the sickness of the poser and the improbability of intercoursing with bona fides.

She's such a poser, always striking a pose for the camera.

He's a poser who pretends to know everything about art.

Don't be a poser, just be yourself.

The poser tried to fit in with the cool crowd at the party.

She's a real poser when it comes to fashion.

He's such a poser, always showing off his expensive possessions.

The poser tried to impress everyone with his knowledge of music.

She's not a poser, she's genuinely interested in photography.

The poser tried to act like a tough guy in front of his friends.

He's just a poser who doesn't actually know anything about the topic.