IMMA BITC*H... B * I * T * C * H IMMA BITC*H... COZ, IMMA BITC*H...?

Do U remember "gossip girl"? Think it was 3 season when Chuck Bass father Bart Bass died. And Chuck was very angry. There was a party where a girl was playin' on guitar and singin' "IMMA BITC*H... B * I * T * C * H IMMA BITC*H... COZ, IMMA BITC*H..." Who is the singer and what's the name of the song? Plz, help me coz I want to find the song