"It's called job security."
What the Tattoos Really Say:
With a movie like The Mummy, you might assume that the tattoos are random markings the costume or makeup people applied to look cool. But as you're about to find out in this article, there is almost always a real attempt to make foreign-language tattoos say something meaningful. It's just almost never correct.
So when translated, the meaning of the Medjai's tattoos initially seems reasonable -- they have references to Imhotep's name and some kind of secret city in the desert.
Made all the more secret by having it tattooed on his face, of course.
Specifically, the approximate English sounds for these five characters are I, M, H, T and P -- Imhotep.
And as for their rippling pecs: