hanging around指“无所事事，闲逛，游逛，留在附近，到处游荡”。

【例句】
I like going shopping with my friends but we spend most of the day just hanging around in the mall.
我喜欢和朋友一起去购物，但我们大部分时间都是在商场闲逛。

Well, there might be a lot of us hanging around with lots of free time on our hands.
估计到那个时候就有很多拥有大把空闲时间游逛的人了。