Commonly used in the black community but also used in white suburbia as a way of saying "Hello, how are you/ What is going on". The saying originated in the fine city of Detroit, Michigan.
During a phone call.....
Dope Fiend: Hello Dealer: What up doe
Dope Fiend: You got tha hard??
Dealer: Nigga stop playin on my mutha fuckin phone, you know i got what you need.
Dope Fiend: Bet, let me get a fat dub.
Dealer: Nigga meet me at the liquor store on Westwood.
Dope Fiend: Aight bet it up, 100
Dealer: 100
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.