If something is the stompiest, it is the most likely to make a loud noise when you walk on it.
The word stompiest can make people think of heavy feet and big sounds.
Examples:
The stompiest part of the floor is over there.
She has the stompiest shoes in the whole school.
The stompiest person in the room is making a lot of noise.
The stompiest dancer in the class is always making the floor shake.
The elephant is the stompiest animal in the jungle.
He is the stompiest person I know, always making a lot of noise when he walks.