Monos sou or in English alone, means that someone is alone in their life even tho they are surrounded by people. It's also used when someone says or does something and nobody relates to it or they just ignore him.
Example 1:

There is a conversation in the room and suddenly on of the guys out of the blue says something that has nothing to do with the conversation. Then one of his friends replies saying : Monos sou

Example 2:
There are people at a camp drinking hot chocolate around the fire. They are discussing about the day and what they did. Suddenly Nura, who haven't said anything in the past hour says : '' I want to burn everything. ''
Chalaka says: Monos sou
by Kwkwnanthebarbarian September 18, 2018
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