Kanye West -- Under Attack Over 'Parkinson's' Lyric On New Album

Kanye West is being slammed as "ignorant" and "distasteful" over a lyric on his new album which uses Parkinson's disease as a punch line ... TMZ has learned.

The song in question is called "On Sight" -- which includes the lyric, "A monster about to come alive again / Soon as I pull up and park the Benz / We get this bitch shaking like Parkinson's."

Now, TMZ has learned the American Parkinson Disease Association is upset about the lyric -- with the org.'s VP Kathryn Whitford telling us, "We find these lyrics distasteful and the product of obvious ignorance."

FYI -- the APDA has been around for over 50 years and it's the largest organization in the country dedicated to helping those with Parkinson's and furthering efforts to find a cure.