Also, this seems to be acknowledgement of the word {ngIS}, which was coined for a Klingon novel but wasn't canon.
Okrand wrote:
> {ngIS} might work for the Tin Woodman's oil, though it is a particular kind of lubricant use for disruptor cannons I am told. A more general word is {watrIn}.
This is very funny, as I am fairly certain he just looked up "lubricant" on {boQwI'} and found the entry on {ngIS}.