The word Sus is meant to suggest that somone is believed to be Shady or false. They are hiding something or are believed to have a serious character flaw which makes them undesirible as a friend or acqaintence. It is derived from its root word Suspect.
Here is a brief history of the Greek language to help us understand its changes and its evolution. Modern Greek is a descendant of the Ancient language and is affiliated to the part of the Greek or Hellenic branch of Indo-European. After reading about the language, get also informed about the products in Greece.
There were three major dialects in ancient Greece, Aeolic, Doric and Ionic. Each of these were from different tribes, the Aeolians lived in the islands of the Aegean, the Dorians, from the Greek coast of Peloponnesus, including Crete, Sparta and other parts of West Coast Asia Minor.