This word is used widely by Malaysians and also Singaporeans. This word is also known as one of the most super negative word. It is not a swear word, believe it or not. It's an expression of a combination of multiple negative feelings as follows:-
bored, fed up, sick of it, soured,
bitter, headache, monotonous and any negative feelings you can
think of.
"Everyday, doing the same thing over and over again. I'
m so damn sien ar!"
"I
hate to do this report. Everytime I think of it, I'
m so sien"