The best feminist rap songs and feminism in hip hop music:

Beastie Boys - Song 4 The Man (Out of "Hello Nasty" classic LP from 1998)

Kanye West - All Falls Down (with Syleena Johnson on the hook)-
Kanye is talking about the supreme values of physical comfort:

Salt N Pepa - None of Your Business:
(Single from "Very Necessary" the 4th album which also featured "Whatta Man")

Slick Rick - Hey Young World:
(From the massive classic "The Great Adventures of Slick Rick" LP on Def Jam, anti Brainwash, in a great story style and not preaching-style)

2Pac - Brenda's Got A Baby:
(Freshman 2Pac was out with the single from his debut rap album "2Pacalypse Now", the song featuring Dave Hollister)

Positive K - I Got A Man
(Stubborn man VS wise woman)