Most likely they are afraid or scared. They maybe cold.
There is an earthquake
Shaking.
shaking my body
Sniffing.
It means they start shaking and they cannot stop, or they shake and keep shaking repeatedly.
Tremulous-quivering or shaking slightly.
smh = "shaking my head"
shaking her butt ...
Means someone is shaking and dancing
Shaking My Damned Head
It could mean a lot of things. Maybe they are cold?
you are a bad driver