The female version of an "average Joe". A girl that's rather plain and doesn't stand out in a large crowd.
Girl #1: Omg! That girl in our second period is sooo plain, like geez all she does is listen to the Top 10 hits playlist and watch gossip girl!
Girl #2: I know right! She's such an average Jane.
Girl #2: I know right! She's such an average Jane.
by lordwussycat June 14, 2015