Siao On
Origin: Hokkien/Singlish – describes a person who is too serious in things that he/she does.
Siao On is a combination of hokkien and english which is used to described a person who is always on the ball and often is the one that spoils the market for everyone.
Adjective:
“Eh John, don’t be so siao on leh. Exams are still so far away, don’t study lah…come out and play with us at the playground leh.