Penis Envy, by Uncle Bonsai
Full lyrics here.
Several from the musical version of The Color Purple apply, but especially the title number (later reprised) and the song I’m Here and in a less poetic & less subtle way the song Hell No! (video from Tonys).
Oh, yeah! How could I have forgotten Hell, No!?!
“Evolve” - Ani Difranco
I’m a Bitch sung by Meredith Brooks is a good one and one of my theme songs. Don’t let the title put you off. The chorus runs like this:
Um…45 posts and no mention of Alanis Morissette - You Oughta Know?
Those aren’t empowerment songs. Those are “just settle and deal with it” songs.
Walk Away - Kelly Clarkson
Pumping beat, inspiring lyrics, and a music video of a bunch of people lip syncing and doing goofy dances to the song. 
You know, there’s probably more from musical theatre we haven’t thought of yet: “Anything you can do I can do Better”; “Don’t Rain on my Parade”; “Wash That man right outta my hair” . I think there’s even a song in Sound of Music called “I have confidence in me”.
and despite the fact that many traditional folk songs are sexist, there’s also a subset of traditional ballads where the woman turns the tables on the man, or perhaps by dressing up as a man. I’ll dig around for some actual titles if no one else jumps in.
PS - Did anyone mention “Slow Hand” or “Sisters are doing it for themselves”?
I am beautiful. Christina Aguilerra.
Bachelor Girl - Permission to Shine
For a rockin’ get-up-in-the-morning-and-kick-total-ass song, it’s hard to beat “Ready to Go” by Republica.
Also there’s Naked Eye by Luscious Jackson.