EXCLUSIVE

Meek Mill is throwing stones from a giant glass house, because while he's blasting Drake -- a Detroit rapper claims Meek actually jacked parts of HIS song.

17-year-old Lil George dropped his song, "I Got the Sauce," back in October ... and released a music video on social media in April. It wasn't a huge mainstream hit, but he says it got a lot of underground hip-hop cred.

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Cut to June, when Meek debuted his album with the song, "I Got the Juice." George says fans immediately started calling out Meek for ripping off George's rhythm and hook.

LG thinks it's pretty ironic Meek's calling out Drake -- yet says he's not upset about the sitch. He understands artists sometimes borrow from each other ... and he's not even looking for a paycheck.

George says he'd be cool if Meek just acknowledged 'Sauce' inspired 'Juice' ... but it ain't gonna happen.

Meek's rep says there's absolutely no rip-off, and Meek's never even heard 'Sauce.'