Vagineer

Vagineer is a famous GMod Monster that appears in many Gmod machinimas. He resembles an Engineer from Team Fortress 2, but his lower jaw has been stretched downward to the point of resembling female genitalia. He was created by YouTube user J16FOX, but has been made famous by other users, such as Mssnor.

Even if Vagineer is a very famous (if not even the most famous) Gmod Monster, he doesen't have an official theme song. A couple of people have tried to remedy this with varying degrees of success, but none are as yet officially recognized.

Bio
Vagineers are a very mysterious variety of Gmod Monsters. They can only speak backwards, and they are typically ill mannered toward others. Most Vagineers devour and kill people violently and horribly, but sometimes they are friendly and docile. Some have been known to lend a helping hand in times of need, but they are easily offended and do not take lightly to insults.

Origins
Vagineers are possibly from another universe entirely. They have been known to distort reality to their liking; often they use this ability to turn victims into "Vagi" versions of themselves. They have been known to interact with other Gmod Monsters, and have been able to summon creatures such as the Snyphurr. There is also a theory which says that the vagineer is the result of a sort of virus or parasite called "Vagineerus Hamalus".