A gimp is when a chickens leg is sort of like a twisted leg, but instead of twisting it starts bending at the joint until they are walking with their knee instead of their foot. Then there toes start to curl and their foot is facing out.
That's not "gimpy", that is a leg bone deformity. Twisted tibia, Valgus Varus
https://www.merckvetmanual.com/poul.../noninfectious-skeletal-disorders-in-broilers