derogatory noun reffering to people from the inland empire, used especially in Newport Beach. This is a shortened synonymn for 909er. Possible ways to distinguish a nine-o are trucker hats, older lifted trucks with gigantic volcom stone or famous star stickers, wife-beaters, a smoggy residue on the clothing,and a complete lack of mental aptitude and class.
by Tmart June 23, 2005
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