The spelling of the word "blellum" is not commonly known, as it is a Scottish term that is rarely used beyond its country of origin. Phonetically, the word is spelled as /ˈblɛləm/, with the first syllable pronounced as "bleh" and the second one as "lem". The use of double consonants in the middle of the word indicates a hard break between syllables, which can make pronouncing the term a bit tricky for those unfamiliar with the Scottish dialect.
The word "blellum" is of Scottish origin and is derived from the Scots language. It is fairly recent in terms of etymology and emerged in the early 20th century.
The term is believed to be a blend of two Scots words: "blether" and "bellum". "Blether" means to talk excessively or to babble, while "bellum" is Latin for war or conflict. By combining these two words, "blellum" was created to refer to someone who talks excessively or non-stop.