If something is snappable, it can be broken easily with a quick movement.
Snappable things are usually not very strong or well-made.
Examples:
This stick is snappable.
The cookie is snappable.
The snappable toy broke when I dropped it.
I like snappable crackers because they make a funny sound when I break them.
The snappable bridge broke when the big truck went over it.
The snappable pencil broke in my hand.