If something is sprawliest, it is the most spread out or taking up the most space compared to other similar things.
Sprawliest can make people think of big things that take up a lot of room.
Examples:
The elephant is the sprawliest animal at the zoo.
My bed is the sprawliest thing in my room.
The sprawliest tree in the forest is the oldest one.
The sprawliest cake at the party was the biggest one.
The sprawliest snake in the world would be very long.
The sprawliest building in the city is the tallest one.