Derives from Russian slang, means 1 breast. A pair is called Siski. It's a term of endearment. You can call someone Siska as a way to tease the person.
Hey Siska, Piska, how goes it
by ilikehotsauce July 29, 2010
Can be a term of endearment in some Slavic language, and means dumpling or pinecone. It is similar to being called 'Punkin in the U.S.
My little girl is a sweet little Siska
by akgrl October 22, 2014