The first Vagineer was originally a normal RED Engineer, when a Spy's Sapper was lodged in his 'crotch'.

The difference in physics and logic between the two universes caused a 'Logical Reflux' that disrupted the Engineers' state of being, causing their mouths to stretch downwards and giving them their present powers and reversed speech. The laws of physics and logic are much different in TF2 than Half-Life (much more than Xen), and the dimenional breach directly affected a group of unfortunate Engineers. The dimensional rift created at Black Mesa affected the Team Fortress 2 Universe as well as Xen, but not in such a violent manner. It is also possible that Vagineers were created as a direct result of Half-Life's Resonance Cascade. The newly created Vagineer went insane, devouring the micspammer and everyone else on the server. The flawed logic of the micspammer disrupted the Engie's reality, making him speak in reverse. This particular Engineer was affected by this in such a way that his mouth distorted into a vulvic shape. Prolonged exposure to the effeminate tones of Bieber causes increased estrogen production in whoever listens to them. Being a F2P without a mic, and lacking anyone helpful on the server, the Engie did not know how to mute a particular player.

Some believe that Vagineers were created when a F2P RED Engineer on Goldrush was forced to listen to someone micspamming Justin Bieber's 'Baby'. There is also a theory which says that the Vagineer is the result of a sort of virus or parasite called 'Vagineerus Hamalus'. They have been known to interact with other Gmod Monsters, and have been able to summon creatures such as the Snyphurr. They have been known to distort reality to their liking often they use this ability to turn victims into 'Vagi' versions of themselves, as seen in the cases of Scunt and VagiSpy. Vagineers are possibly from another universe entirely. 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. Most Vagineers often kill and devour their victims violently and horribly, but sometimes they are friendly and docile. They speak in 'Vaginese', their own unique language that mostly consists of an Engineer's voice clips in reverse, with a few exceptions like 'Gottam!', and they are typically ill mannered toward others. Vagineers are a mysterious variety of Engineer Monsters.

Team fortress 2 gmod