For those who don't know who Muur is, they are an Afrocentric (i.e a black supremacist who claims that ancient Greece, Egypt, Rome, China, Japan etc were all founded by negro populations).
They take their name from MU, the pseudo-historical lost continent in the pacific. Many Afrocentrics believe that the black race originated there, but that after a cataclysm their 'motherland' and advanced technology (including spaceships and lazor technology)were lost. Oddly though, most Afrocentrics are unaware that James Churchward (the inventor of MU) claimed it's inhabitants were white skinned and not dark.
''The dominant people [of Mu] were white in color with “clear white or olive skin''.
- James Churchward, The Lost Continent of Mu, 1931, p.18