Cool thanks! Some funny comments here lol.the literal translation is:
the mouse is playing under my clothes.
What it really means is depends on the context. It can be used for:
Excitement about something that you can't express, for example:
-Gossiping about something you know might not be true
-Getting ready to cause mischief
-Getting ready to be naughty
It's a very old tongue expression though and is hardly ever used anymore.
Well, I cant fap to this.....
Where there's a will there's a way....