Always thought the word 'blather' was a cross between blabbing and lather.

Shows what I know -> https://www.thefreedictionary.com/blather

 

blather

(ˈblæðə) or

blether

vb

(intr) to speak foolishly

n

1. foolish talk; nonsense

2. a person who blathers

[C15: from Old Norse blathra, from blathr nonsense]