The phrase “we wuz kangz” which is usually accpompanied by “kangz n shiet”, is an expression used by the users of 4chan.org on the subpage called /pol/ (politically incorrect) board to make fun of people who adhere black-Egyptian hypothesis.
The hypothesis is a heavily disputed theory of ancient Egypt, where people part of this movement think the civilization and the most notable royal figures were African ethnicity; including Cleopatra, Tutankhamun, and Pharaoh Khafra.
Pharaoh Khafra is generally believed to be the face depicted on the great sphinx of Giza.
The phrase has first appeared in late-2015, on the message board website 4chan.org’s subpage called /pol/ due to the the increase in sceptical and critical stance towards the new African-American civil rights protest surrounding the racially charged police brutality, which has spawned countless controversies, most notably the #blacklivesmatter movement, and civil unrest in Baltimore.
As of 2020. You can go onto pretty much any kind of gaming or politics related forum and type on “WE” and someone will follow up with the rest of the phrase.
You can say, the phrase and the meme it has spawned, is so widespread, you don’t even have to search for it.