(out) on the town
Visiting a town or city for a day or evening for the purpose of having an enjoyable time, typically by visiting various establishments, such as restaurants, clubs, etc. We were out on the town last night for Valerie's birthday. That's why we're all exhausted today. I had a night on the town with my closest friends from school last weekend.
out on the town
Fig. celebrating at one or more places in a town. I'm really tired. I was out on the town until dawn. We went out on the town to celebrate our wedding anniversary.
out on the town
If someone is out on the town, they are enjoying themselves in a public place such as a bar, club or restaurant. It was Saturday and he would have liked to be out on the town with a girl, not working.