Japanese. Typically used as "go shi-shi", which means, excuse me, "I have to pee [pee pee].
...or Chinese. "Xie xie", which could easily be heard as "shi-shi" if the listener is unfamiliar with Chinese, means "thank you". In Japan, "shi shi" sounds pretty babyish - it's usually used when speaking to little kids or pets.
"Shishi" in Tagalog doesn't have a specific meaning. It may be a misspelling of the word "sisig," a popular Filipino dish made with chopped pig's face and chicken liver, seasoned with calamansi and chili peppers.
Make shishi or Go shishi...either one works.
The Malayalam language. This is an Indian language.
Yes, Bengali is a real language. It is the official language of Bangladesh and the second most spoken language in India. The language is also known as Bangla.
Spoken language, written language, and signed language.