I hear people saying that they're "having a natter" with their friends, or 'If you want to have a natter about starting a project, give me a call!'.
On different websites there are different definition:
The Free Dictionary - to talk idly and at length; chatter or gossip
Wiktionary - To talk without purpose.
Merriam Webster - to talk about unimportant things for a long time
Dictionary.com - to talk incessantly; chatter.
Oxford Dictionaries - talk casually, especially on unimportant matters; chat
Cambridge Dictionaries - to talk continuously for a long time without any particular purpose
These sounds quite negative to my ears, even rude, but whenever I hear it get used, it's rarely for negative reasons. Also, is it informal? Some clarification would be nice, examples would be awesome!