A fork of Rural Dictionary
in Sabah-Hakka dialect, ngai sat can mean "The fuck?", or which Cantonese says "Ngo diu! (I fuck!)", but not in a seethe tone.
A: Ngi hon, BN oi hee nga tiu geh internet service tax liao. (A: You see, BN wants to raise our internet service tax.) B: Ngai sat. (The fuck?)