马甲 has a some different means. It might mean a waistcoat. It might also mean fake or visual identity.
这个是我的马甲(我的衣服)
这个是我的马甲账号(Fake identity)
May 25, 2010
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马甲 always use in the BBS.means If someone agreed with me so I wanna speak some badly to him so I can apply for a new ID and do that so that he cant know who I am. That means 马甲..