Informal:
* The bakery had a humongous chocolate chip cookie the size of my head!
* They built a humongous house with a swimming pool and a movie theatre.
* I ate a humongous plate of spaghetti and meatballs.
Formal:
* The company made a humongous profit from its latest product launch.
* The ancient redwood tree was humongous, towering over the forest floor.
* The construction project required the use of humongous cranes to lift the heavy beams.
Humorous:
* I bought a humongous pair of sunglasses, hoping to become a celebrity.
* My pet hamster has a humongous appetite for sunflower seeds.
* My friend's dog is so humongous, it looks like a small horse.
Note: "Humongous" is considered informal and slang. While it can be used in formal writing, it's best to use it sparingly and in appropriate contexts.