It comes from the American Civil War. The battles of the civil war were bloody and gruesome. Often after a bayonet charge, the dead and wounded would often end up in a tangled and bloody pile. When the fighting ended, the stretcher-bearers would come out to sort the dead from the wounded. One way they had to sort the bodies between the dead and those still living, was to lift a leg or an arm and jostle it, to see if they got a rise out of the body. As you can imagine having one's limbs shaken while already wounded was quite a painful experience, so a soldier learned to move or wave one of his arms or legs by himself to indicate to the stretcher-bearer that he was alive. After a time, the stretcher-bearers would first yell to the piles of bodies "shake a leg or arm" as they approached. After a time, the shortened "shake a leg" began to be used in any situation where one wanted to rouse someone to action.
On the double comes from the term "double time". When marching if you double time you are running. So on the double basically means hurry up.
"Yalla" in Arabic means "come on" or "let's go." It is commonly used to urge someone to hurry up or to indicate readiness to move on to the next activity.
it means "hurry up" or "come on" It also means "GO" or "GO AWAY"
The expression "name your poison" means What will you have? when offering a choice of intoxicants.
It means to not act innocent.
The origin of the expression is obscure. It means "ruined everything".
It means: come here, hurry up/let's go!
To 'come the raw prawn'.
In this expression, strike means to come upon or discover.
It doesn't wash means I don't agree
Can a storm come and leave?
shake shake shake your booty