Top definition
An undersized running back who is hard to tackle due to his lack of height, low center of gravity, stocky build and extremely thick lower body.
1) Damn! Maurice Jones-Drew just ripped my fantasy team defense for 174 yards and two touchdowns! That dude is a muscle-ball, you just can't tackle him!

2) That runningback is a damn muscle ball! We couldn't tackle him in a phone booth!

muscle jones-drew football
by Coach Thomas October 23, 2011
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