How do you spell tootoocarmoon?

The word you're trying to spell is "toot-toot-car-moon." This is a playful, onomatopoeic phrase that combines the sounds of a car horn ("toot-toot"), the word "car," and "moon."

There's no official spelling for this phrase, as it's a made-up expression. However, the spelling "toot-toot-car-moon" captures the intended sound and meaning most accurately.