The name Rageguy refers to the main character of a series of crudely-drawn comics (AKA Rage Comics) typically consisting of four panels, portraying situations that can bring rage and exasperation, with the main character screaming with anger as a result. Due to its simplicity and exploitability, Rageguy has been proven popular thus being evolved into a comic series now known as Rage Comics.
The first instance of Rageguy came in 2008 on the 4chan “Random” (/b/) imageboard. The image consisted of a 4-pane comic made in MS Paint portraying the “toilet splashback” experience. The first three panes described the incidence and in the fourth pane, a drawing of Rageguy screaming appeared with a caption saying “FFFFFFUUUUUUUUUU-” on the right of the face in red letters. In other words he was going to say the f word. Later, this was copied, but with the rage guy being replaced by a Me Gusta face.
After the first Rageguy instance, other derivatives began to appear. The format of the comics remained, for the most part, the same, with the rage-inducing instance being described in the first three panes and the face screaming on the fourth.
Rage Guy appears in Rage Comics when something doesn’t go their way or they lose of any way, or maybe just cause they feel like it. He is one of a lot of faces such as Trollface, Me Gusta, and Forever Alone.