马甲 Traditional form: 馬甲 Pinyin (reading): mǎjiǎ Definitions: corset sockpuppet (Internet slang) vest (dialect) Characters: 马 - horse; surname 甲 - armor, shell; fingernails; 1st heavenly stem Traditional characters: 馬 - horse; surname 甲 - armor, shell; fingernails; 1st heavenly stem