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Bo Jackson 'I'm So Old ...' It Hurts to Pee

4/7/2015 3:32 PM PDT

Bo Jackson -- I'm So Old ... It Hurts to Pee

Bo Jackson used to be the king of TWO sports ... now, he's got problems handling a #1. 

Jackson called in to "TMZ Hollywood Sports" and told us about how he's getting his 52-year-old body ready for his annual charity cycling event, Bo Bikes Bama ... but he's moving a little slower than he used to. 

"I got up this morning and went to the bathroom to pee ... and pulled a muscle," Bo joked. 

But the real headline could be that Bo thinks he's gonna get his "BUTT KICKED" in the ride by his former nemesis Brian Bosworth -- who's announced he's participating this year. 

Check out the clip ... Bo explains how the former rivals reconnected after nearly 30 years for a great cause -- and why he's confident Bosworth will finally get his revenge. 

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