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1.
A really, really, really, really pasty white skin tone. When someone gets an xbox they invariably spend too much time indoors playing it, and the lack of sunlight they recieve results in a lack of melanin in the skin, turning them albino white.

Hilariously, this insult should be applied to people who through no fault of their own cannot develop a dark tan, such as the elderly, ginger-haired folk and computer nerds who should know better.
Max: "Hey, look at that pasty white guy"
Bubba: "Yep, he's sporting a real xbox tan"
by Jamie Douglas September 06, 2006
 
2.
The skin tone one gets from sitting in a basement playing call of duty for days without sunlight.
Jeff: Dude, you have such a great Xbox Tan.

Jim: I know right!, i haven't gone outside all week!

Jeff:... I don't think we should be friends.
by TheTopGamer August 02, 2010