Israeli currency. It's generally used by the conspiracy/anti-semitic/pol crowd to refer to money, with the connotation that Jews are greedy and try to control the market. Part of the le happy merchant meme.
Felix: "first part of the leg that gets shekels....I mean shackled......Oh no''
4chan: blah blah blah ''he knows'' anti-Semitic terms ''yee one of us''