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Ric Flair 's shocking claim that "street drugs" killed Hulk Hogan is simply not true ... this, according to the wrestling legend's widow, who tells TMZ Sports the Nature Boy was fed some bad info.

Flair recently addressed Hogan's death on the "DOUBL3 COVERAGE" podcast ... when he stated he spoke with Hulk the day before he passed about his deteriorating health.

Flair claimed Hogan's doctor stopped prescribing him pain medication to combat his numerous wrestling injuries ... so he resorted to unorthodox measures to deal with his suffering.

We asked Hogan's widow, Sky , about Flair's comments ... and she said point-blank, "That didn't happen at all." Getty

Sky -- who also denied Flair spoke to Hulk the day before his death -- went on to say the icon was under constant

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