derives from... I don't know if it's a common New Zealand term or ideosyncratic... a term for and old beater car that will "probably go" at any minute. With the erudition he shows in his writing, I figured it was some Latin term like "cogito" that it would behoove me to look up. He saved me a lot of digging and gave me a laugh too.
[If you know this just ignore it: "Cogito" means "I think" and is the short term philosophers use to discuss Descartes' argument that starts with "I think, therefore I am." (Cogito ergo sum.)]
Update: After much haranging, I'm editing my typo. We'll put in the link too, while we're at it. Fair enough?