A person who is extremely clumsy, or who often is sporting bandages covering minor injuries, might be said to be incapable of "walking and chewing gum at the same time".
After the third time in one month that the new office assistant was electrocuted while trying to clear a paper jam in the office copier, the supervisor shook his head and asked the Personnel office to move the employee to another department with no machinery in it, as "this guy can't walk and chew gum at the same time".
It's just a jump to the left And then a step to the right
Put your hands on your hips
And bring your knees in tight And then the pelvic thrust that really drives you insane...
Let's do the time warp again!
Well, I was walkin' down the street just a-havin' a think and this snake of a guy gave me an evil wink. He shook-a me up he took me by surprise, he had a motor bike and the devil's eyes...