The kind of strong you get doing CrossFit workouts. Similar to "country strong." The men and women that do CrossFit Workouts rarely change in size, so the aren't huge, but they are extremely strong and have great endurance. Similar to country farm boys that do functional work daily. No abs can compare to the greatness of CrossFit abs. Total core workout.
A person who does CrossFit and is in great physical shape. Constantly varied, high intensity, functional movements = CrossFit. A CrossFitter actually can't wait to get his/her WOD on. (workout of the day)