paint the town (red)
To go out into a city or town and have an enjoyable time, typically by visiting various establishments, such as bars, restaurants, clubs, etc. After our exams finished, we all decided to get dressed up and paint the town red. A: "I was thinking I might go to a museum or the library." B: "Wow, you're really going to paint the town red, huh?"
paint the town (red)
Sl. to go out and celebrate; to go on a drinking bout; to get drunk. I feel like celebrating my promotion. Let's go out and paint the town. They were out painting the town red last night.