Definition of "sia"

sia

/sjɑː˧/

particle
1. (Singlish, Manglish) Tagged at the end of a sentence to express discontent, shock, exhaustion or exasperation.
  Quotations
  […] Really disappointed siah […] The damage is done and no explanation will be accepted...... damn stupid!
  2004, joshley, soc.culture.singapore (Usenet)