"Your quick feet buff has worn out, back to normal dancing time!"
How did I even get this buff, and where do I get another?
: You get the buff randomly while dancing with people. =) The site doesn't notify you when you get it - you can figure out whether or not you have one currently by looking at how long you have to wait in between dances. If it's less than five minutes, you probably have a buff. ^^
If you want another, you just have to dance as much as possible and hope you get one. =) Hope this helps!