Nob is the common misspelling of "noob", commonly mispelled by illiterate Mexicans, Brazilians, and just about anyone from South America, or people who aren't English in origin. Other common examples by such people are "nib" and "nb". Such people actually believe their misspelled version of Noob is correct, and will not correct their spelling or even acknowledge they're doing it wrong.
Mexican: ow i die ur a nob
North American: You mean "noob"?
the appendage that projects from a male groinage, also known as a peni. this protusion is used for stabbation of females unless the nob in question expands due to fellow nobs, these nobs should be removed. when the nob enjoys itself it produces a substance which is the staple diet of cock monsters