and The Shpilkus is

According to the internet, Shpilkus is a yiddish term for something along the lines
of sitting on pins and needles. Some hint at it meaning having ants in your pants.
(you could substitute trousers if you prefer)

Either way, something is bothering you in your buttoxical region and causing you
anxiety and discomfort...

You might wanna check your pants for stray needles, get some spray, or perhaps some
butt creme.