Weegee started out as the Luigi sprite from "Mario is Missing." Later on, people on the internet (started in 4chan) noticed the awkward "staring" pose Luigi was in. A non-sprite picture was made and it was called "Weegee." People started applying Weegee to different situations, and he became a "picture meme," sort of speak. People took this further and started giving his stare the power to turn people into "Weegee Clones." Many videos and photos were made based off of this; that's why he's a meme.