Definition:
God-awful is a slang term that means extremely bad or unpleasant.
Use case:
You can use this slang to describe something that is terrible, awful, or very unpleasant. For example, you can say "I had a god-awful experience at that restaurant" meaning that the food or service was really bad. Or you can say "This movie is god-awful" meaning that the movie is really bad and not worth watching.
• I woke up with a god awful headache this morning, I think I drank too much last night.
• The food at that restaurant was god awful, I couldn't even finish my meal.
• I tried to fix my car myself, but it ended up looking god awful, I think I need a professional.
• The traffic during rush hour in this city is god awful, it takes me hours just to get home.
• My boss's presentation skills are god awful, it's hard to stay awake during meetings.
• The weather outside is god awful, it's pouring rain and freezing cold.