I didn't understand what Jay-Z was saying on Drunk In Love, and than I found this.
what Is this?

While that whole situation was terrible, why is everyone so late with this? You'd think no one here knows who Tina Turner is. Ike Turner, her husband, was a very abusive asshole. Just watch the film What's Love Got To Do With It.

With Jay-Z, it was a sexual innuendo. His verse is just bad in general, tho...

I constantly quote this IRL, for silly purposes. So it was epic to hear it. Doesn't surprise me ATRL doesn't know the iconic film.

Though, yes sad relationship.

Ok, so you know

can you explain this please?

Ike Turner discovered her, they ended up in a relationship before they got big and got married.
He raped her,beat her all the time and basically had her under his control until she fought back and got a divorce.

She ended up keeping the last name due to her new name being part of who she is in terms of fame.

and Why is Jay-Z quoting Ike?

Because he doesn't think, very poor verse to use.

Because it's a frequently quoted line in the black community from a movie that's iconic in the black community.

It's a play on words. It's a situation that's been made fun of in pop culture for ages. People just need something to make a big deal about.

I still use that line.
You better eat this cake Anna Mae!
They over exaggerated it in the movie though. Ike still was one of founders of rock and roll

Woo lawd, this movie