Another word is crowhop.
To jump with stiff legs means to lock your knees.
it means that you just cant dance
It means bend yours legs and push off the ground. So, pretty much a normal jump but most likely with arms.
stiff
Cowboys loved a colorful phrase! This was another term for cowboy. The image is of the cowboy spending so much time in the saddle that he's stiff.
Dove means to jump head first into the water with your legs and hands straight
To get a Stiff, or Stiffy, is school playground giggles for an erection
Stiff
Short,stiff hair
stiff or made out of wood
Short,stiff hair
Considering that this is in the car starting problems category, I am assuming you mean a Jump Box to start a car. In this case, a jump box is a device with a battery and attached cables that can be used to jump start your car. This is used when a car battery has died. Another alternative is to use jumper cables with another car.