The following is a title of a post over 人民网.
15岁女孩出版6万字英文小说!不就膝盖吗?拿去!
Source: http://m.jy1377.com/a/100/32674.html
My dictionary (Pleco) only has "knee" as the meaning. The same is true of MDBG.
But it doesn't make sense to have "knee" there. So what is the meaning in this context?