A person who talks excessively and foolishly; a blatherer or someone prone to senseless chatter.
Possibly from 'blater' (one who blats or talks nonsensically) combined with the suffix '-oon,' a playful augmentative suffix (as in 'buffoon' or 'harpoon'). The suffix adds a tone of mockery or exaggeration.
The '-oon' ending makes this word feel like a cartoon insult—'blateroon' sounds almost like it should be a character in a silly story! English speakers loved creating insulting names by adding '-oon' to sound extra ridiculous.
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