1.Someone who deliberately puts his or herself at a disadvantage in a video game, typically a FPS, by using the weakest and/or least popular guns, or a gun that is poorly suited for the situation. They believe that if they do so, and still obtain some level of success, that it makes them more skilled than everyone else.
2. In a shooting game, the opposite of a tryhard.

It is my belief that "weapons hipster syndrome" results from a deep insecurity on the part of the hipster. They refuse to level the playing field, as that would truly test their skill, and if they were unable to succeed on said level playing field, they would have no excuse and nothing to fall back on, as they could no longer blame their gun. It may also result in a desire to be different, which can be caused by insecurity as well.
Occasionally, a weapons hipster will go so far as to suggest that a serious competitive player stop using powerful guns, even when facing other serious competitive players that are using powerful guns.

When you eat dirt for the first time and leave your family to build a shack in the woods