Eli Roth -- I GOT ROOFIED

Eli Roth says he came dangerously close to being taken advantage of by a mother and her daughter in Vegas 5 years ago -- after the insidious duo ROOFIED one of his drinks ... but thankfully, Quentin Tarantino came to his rescue.

The "Hostel" director recounted the story during an interview with Fox Vegas, claiming he was out for a night on the town with Quentin and RZA from Wu Tang Clan -- when he struck up a conversation with a mother and her daughter at some nightclub.

As the conversation unfolded, Eli says he began to feel really woozy -- and the mother/daughter tag team offered to bring Eli back to his room.

But Quentin immediately knew what was up -- believing the women were planning to rob Eli -- and insisted on taking Eli to his room himself.