Origin: Singlish/Hokkien – the english translation of “Lao Jiao” in hokkien means someone who is experienced and is considered to be a senior at a workplace.
Old Bird is used to describe someone who has been at a e.g. a workplace or army for years and is considered to be experienced and a person of seniority.
Ah Beng: “Eh John ah, how do I settle this issue ah? There don’t seem to be any documentation or guide on how to do this?
John: “You go and ask Peter, he is the old bird here, so must have dealt with this issue before.”