A word that can be used to express almost any negative feeling. Its exact meaning depends on the context, its function is to emphasise the current feeling of the individual who is using it. It can
mean sadness or
disappointment but in some cases it can also
mean sympathy or even astonishment.
Other form of it is "mooo" wich means an intense bad feeling
"Mooo! I have a very bad headache. I feel like im dying"
"Mo, i feel you, bro. Hope you'll feel
better soon"
"Why im i still
single?"
"I dont know. Im
single too. Mo..."