CP's definition of line jumping as per the park map:
"Line Jumping Is NOT A Sporting Event
To permit guests to enjoy rides as quickly as possible, line jumping is not allowed. Line jumping is defined as: cutting in front of other guests already waiting in line; leaving a line, then trying to re-enter the line at that same point, or saving a place for someone. This includes using rest rooms and purchasing food and drink, so please make all stops before entering a line. Line jumping, regardless of the reason, may lead to dismissal from the park. This rule is strictly enforced, with no refunds."
Well.. for how strongly they word it... I've seen more of it happen this year than any other at CP.. and I've not once seen anyone get removed from the line, let alone the entire park.