to be fed up with

Silhouetted by the moonlight was a towering form, an omnipotent Garfield, tentacles writhing and limbs crackling as it stretched higher. Before it stood a man dual wielding pistols, a trail of expertly assassinated bodies behind him. In the being's rampage across the city, it killed the man's dog. "What could this mere mortal do?" the beast mused, bellowing a deep, echoing laugh. "All this for a dog, John?"

The man stared up at this godly Baba Yaga, this monstrous Boogeyman. He calmly reloaded his firearms, and with a calculated flame in his eyes, whispered "...Yeah."