Mek-Bosses are the biggest and most powerful Meks, whose inventiveness helps them design machines of war beyond any other Mek or Big Mek, allowing them to rise to such a position of power has to lead their own Warband.
Ork warbosses sometimes have variant titles depending on their functional place in Ork kultur. The variation is usually based on the boss' favoured combat tactics. Mekboss - Mekboy bosses are known as "mekbosses". https://warhammer40k.fandom.com/wiki/Warboss#Variant_Titles
https://warhammer40k.fandom.com/wiki/Mekboy
Mek Boss Orkimedes - Orkimedes is the mysterious Mekboss that serves the infamous Ork Warlord Ghazghkull Mag Uruk Thraka and his Great WAAAGH!. Imperial scholars have been unable to identify this mysterious Ork technical genius whom they have dubbed "Orkimedes." Although he has not been identified, his handiwork has been reported many times during both Ork invasions of the Hive World of Armageddon. The combination of Orkimedes' technical innovations and Ghazghkull's visionary strategies have lent the Greenskins of the Great WAAAGH! an edge that those seeking to stop them have learnt to fear -- Tellyporta strikes. Many times, Ghazghkull has lured an enemy into attacking a seemingly vulnerable Ork warband, only to tellyport overwhelming numbers into the fray as the battle unfolds, turning the tide enormously in favour of the Greenkins. He is also responsible for creating heavily kustomised Gargants and Ork submersibles. As such, he is one of the most highly sought-out priority targets for assassination by the Imperium's Officio Assassinorum.
Buzzgob is a powerful and brilliant Ork Mek-Boss and the right-hand Ork of Warlord Garaghak.
Indeed, Buzzgob can be said to be the true genius and power behind Garaghak's operations in the Forsarr Sector, developing powerful weapons for the Warlord's forces in his own private manufacturing base on the world of Kastorel-Novem. Seeking to put an end to the threat Garaghak posed to the sector, the Imperium would send a strike force of Raven Guard Space Marines and Elysian Drop Troop Imperial Guard to kill Buzzgob and destroy his factories on Kastorel-Novem. In the end, however, the plan failed, and Buzzgob continues to develop ever-more devastating weaponry for Warboss Garaghak and continues to play his role in Waaagh! Garaghak. Buzzgob leads his own private army of Deff Dreads, Mega Dreads, Killa Kans, and Stompas known as Buzzgob's Dreadheads.
Da Meklord, Da Biggest Big Mek, was a Bad Moons Big Mek Warboss, who commanded the Tekwaaagh!.https://wh40k.lexicanum.com/wiki/Da_Meklord
Mekwaaagh! - Led by a Mekboss, they usually focus around looting entire worlds of their resources, technology, weapons, and anything else of value. Its armies often consist of large amount of Lootas and Deathskulls. In addition, its leading Meks will usually focus on testing out their latest destructive inventions. Mekwaaaghs! are defined by their heavy use of "dakka" (firepower) and esoteric technology.Notable Mekwaaaghs! has been observed on Ryza and in Waaagh! Planetsmasha.
