If you say that a girl is a tomboy, you mean that she likes playing rough or noisy games, or doing things that were traditionally considered to be things that boys enjoy. 假小子
noun [专属名词]假小子,行为似男孩的顽皮姑娘
She's a tomboy, not a girlie girl at all. 她是个假小子,一点女孩样都没有。