peter poser

Typical kid who takes pictures of all his dad’s cars to impress girls because he has a little penis

Look at that Peter Poser at it again on instagram

Band poser

A guy posing as a piano player, guitarist,drummer, or another instrument.

The guy wished he had been naturally gifted music maker, but knew it wasn't his particular skill set. He would still claim it in public, even if it wasn't his instrument, since he was a band poser.

Vim poser

A person who uses the text editor Vim extensively, especially in public and social spaces, with the implicit goal of signaling one´s technical acuity and/or alignment with free and open-source philosophy.

A: Jona uses Vim all the time too but he´s not making use of even the most basic keybindings.
B: Man this guy is such a vim poser...