One who is without pigment, or ethnically white. Usually to describe a person, it can also describe a location or thing that is without the presence of 'color'.
The word is used most, derogatively as well as affectionately (amongst friends and family), to describe white people.
(+attila) john smith
(+attila) that's almost as white as say, "Sean Mayer"
(@gaurav) sean mayer
(@gaurav) it doesn't get much whiter than that
(fleet) sean mathew mayer
(+attila) Matthew kinda sounds like "NO-HUE"