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Origins of the Ork Waaargh/Waaagh/Waa - look, Orks are not known for consistent spelling.

Book cover
Waaargh Orks cover art by Wayne England

Games Workshop revamped the Orks in 1990 with a new model range and new background. Part of this was the source book Waaargh! The Orks that detailed the Orks and their Kultur. Orks adopted some of the characteristics of '80s football hooligan ↗ stereotypes, often chanting the phrase 'ere we go! ↗ The book also introduced the concept of a Waa.

Waa-Ork is a spontaneous happening which starts suddenly in obscurity, then gradually gathers momentum. More and more Orks, clans, and tribes become part of the gathering strength of Waa-Ork. In a process that may take up to 300 years to reach its peak, the whole of Orkdom becomes agitated, disturbed, and dynamic. Waa-Ork is an resurgence of Orkdom into the universe. The Waa-Ork is a time when tribes come together, a time of great works, migrations, wars, and conquest.

-Waaargh! The Orks by Nigel Stillman & Bryan Ansell

Bill King ↗ wrote four short stories for the book. In one of them, an Ork boss gees up his troops before war with the following exchange.

"An' anybody else 'oo gets in our way. Coz we'z the Orks. Wot are we?"

"We're Orks!"

"Wot?"

"Waa-Ork!"

-In the Warp, Something Stirred by William King

So, some evidence waaargh! might just mean we are.