ants in your pants”不是指“蚂蚁在裤子里”，而是焦躁不安；坐立不安。

【例句】
Why do you have ants in your pants today? You can't sit still for one second.
你为什么今天坐立不安呢？你连坐一秒钟都不行。

Relax and enjoy yourself — you’ve really got ants in your pants about something tonight!
放松，玩得开心点！你今晚似乎对什么事焦躁不安的！