You've hit it this time. He's gone to town.你这次猜对了。
他是进城去了。
We are going to town to see the illuminations.我们打算进城看彩灯。
All the sailors disembarked from the vessel and went to town.水手们都下船去城里了。
"go to town"除了有进城的意思，但在口语里更多的是如下几个含义。
1.To put a lot of money into sth. 挥霍，大手大脚地花钱；无节制地花钱With £ 800 spending money for each couple, you can really go to town!每对人有800英镑的零花钱，你们真正可以大把花钱了！《柯林斯高阶英汉双解学习词典》He's really gone to town; you should see how many clothes he's bought.他真是滥花钱，你瞧他买了那么多衣服。
《汉英大词典》When they give parties they really go to town.他们搞起聚会来真是挥金如土。
She decided to go to town and redecorate all the rooms in the house.她决定砸大钱装修所有的房间。
They've really gone to town on decorating their new home.他们真的花了许多钱来装饰他们的新家。
They've really gone to town on their wedding.他们为了婚礼确实花了大钱。
Lucy really went to town for her mother's birthday party.露西为她妈妈的生日派对花了很多钱。
2.To do sth. to excess or in an uninhibited manner 做事起劲；下力气下功夫做某事； 以极大的精力做（某事）;拼命地干，满腔热情地干Look at all those ants working. They are really going to town.看这些正在忙碌的蚂蚁，它们干得真起劲。
The kids sure went to town on those cupcakes—there's none left.《老友记》S901 | Joey看到Rachel刚出生的小孩在拼命吸奶的时候脱口而出了这么一句：Man, that kid is going to town.天哪，这个孩子喝起奶来真厉害。
We really went to town on it, turning it into a full, three-day show我们下了真功夫，把它办成了一场内容丰富、为时三天的展览。
《柯林斯高阶英汉双解学习词典》The papers got hold of it and went to town on it报纸抓住这件事大做文章。
《柯林斯高阶英汉双解学习词典》Our team is really going to town.我们队现在真是干劲十足。
Bruce really goes to town when learning Chinese布鲁斯学中文时候可真的用心啊。
3.To be eminently successful 非常顺利We've really gone to town with the stage set.我们已经非常顺利地完成了舞台布景。
The engineers really went to town on those plans.工程师们顺利地完成了那些计划。
4.To lose one's temper 语言或行为放肆；生气，发怒，发火，发脾气When you make a complaint you don't spare their feelings, do you? You really go to town.当你提出投诉时，你没有顾忌他们的感受，是吗？你是真的发火了。
所以现在知道 “go to town”的含义多多，要根据语境来加以判断。
另外，当“go to town”不表示“进城”的时候，前面常用“really”修饰。