bad motherf – – ker.“The Marvel actor, 73, was gifted a purple lightsaber from “Star Wars” creator George Lucas after starring as Mace Windu in the Darth Vader prequels. And the color wasn’t the only unique thing about it: the weapon was also engraved with the letters “BMF,” or “bad motherf – – ker,” a nod to Jackson’s character, Jules Winnfield, in the 1994 action flick “Pulp Fiction.”But during an appearance Wednesday on “The Tonight Show Starring Jimmy Fallon,” Jackson revealed that he didn’t request that his present have a reference engraved on it.“They did that because they loved me — I didn’t ask for it,” Jackson explained to host Fallon.“When the shoot was over, when they presented it to me, it had ‘BMF’ on the on-off button,” the “Glass” actor said of his gift.