Helen Keller was deaf and blind. The only way she could communicate was through body language. Using your hips is basically a raunchy way of saying shut up and just sleep with me.
I heard this song on the radio the other day, and was a bit appalled! Helen Keller was a famous blind deaf and mute girl who learnt to sign. I think this lyric is pretty offensive, and I'm not easily offended... :/
Helen Keller was deaf and blind. She could speak a few phrases, but usually communicated in sign language. The idea that talked with her hips is just some band being silly.
Hellen Keller was blind, so it like means to not say anything, or try and use your head, talk or communicate with your hips ;)