Sometimes A-Rod is seen as a positive distinction for someone who is popular and likable, possibly even affluent and sought after. However, in most places (i.e., Washington State, Texas) being called an A-Rod is considered an insult, meaning “sell-out” or even as a derogatory term for someone who is sexually easy, male or female. The term can be used to describe others in the media, sports, or television, or known acquaintances.
Can be used as an adjective, sometimes a noun.
"Pay Mary Jane enough and she'll go A-Rod for ya."
"Man, Justin is such an A-Rod."