George Lucas got straight Jedi mind tricked into taking a crappy $4 BILLION deal for the "Star Wars" deal ... this according to former Jedi council member Mace Windu ... aka Sam Jackson.

Sam had just purchased some earth food at a Bristol Farms in L.A. when we asked about George's blockbusted deal with Disney.

"He got cheated," Jackson told us.

Photog: You think he deserved more?
Sam: Yeah

Photog: That's a lot of money!
Sam: Not to some people.

So, we gotta ask ...