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.
Homer's poetry of the Iliad and Odyssey were written in a sort of literary Ionic with some borrowed words from the other dialects. Ionic, became the first literary language of ancient Greece until the ascendancy of Athens in the late fifth century. Greek lyrical poetry and Ancient Greek Tragedy was written in Doric.