Dustin Johnson My Back Injury??? Paulina May Have Caused That 😏

No, Dustin Johnson didn't hurt his back earlier this year swinging a club -- instead, he strongly insinuated Wednesday it was a different kind of stroke that caused the injury.

Johnson was out in New York getting ready for the PGA Championship at Oak Hill Country Club when he was peppered with a few questions about the muscle pull that yanked him from the Saudi International golf tournament back in February.

The 38-year-old former Masters champ didn't explain fully what caused the problem ... but he sure hinted it had something to do with fooling around with his wife, Paulina Gretzky.

🚨#NEW: Dustin Johnson reveals that the cause of his back injury earlier in the year may have come in the bedroom 🛏️ pic.twitter.com/cz8o78Yt3e

— NUCLR GOLF (@NUCLRGOLF) May 17, 2023

Check out video of the exchange with a reporter ... when the media member asked the LIV star if he had gotten hurt playing golf or "lifting up" one of his children -- Johnson broke out a huge, wry grin.

"Yeah, lifting up a kid," he said, stifling a laugh. "Just a bigger kid."

The remark left the room full of journalists in stitches ... and the ear-to-ear smile that Johnson continued to wear didn't require any further follow-ups.

Of course, Johnson could've been talking about something completely different ... but both he and Paulina have had all day to clarify the comments -- yet the two have remained tight-lipped.

Congrats on the (maybe!) sex, you lovebirds!!

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