WHAT? JAY Z SAY'S HE DIDN'T KNOW TALKING ABOUT MC HAMMER'S MONEY PROBLEMS WAS OFF LIMITS!

Jay-Z is laughing off MC Hammer's dis.
Hammer, who achieved hip-hop immortality with "U Can't Touch This" nearly 20 years ago, made a comical return this week with a video for "Better Run Run."

He slammed Jay-Z and accused him of being an impostor who stole his "swagger."

Hammer recorded his dis in response to Jay-Z's verse in a new Kanye West song, "So Appalled," which referred to Hammer's money woes from the '90s.

"I didn't know that wasn't on the table for discussion," Jay-Z told British radio.

Jay claims he has nice things to say about Hammer in his book "Decoded," set to be published Nov. 16.

"He's going to be embarrassed," he said. "I said some really great things about him in the book ... It is what it is. He took it the wrong way."