What it means
A loudmouth is the one you can hear from three tables away, the friend with no volume control and no secret safe, forever holding court, talking over everyone and announcing things that were definitely meant to stay private. It's not always malice, just zero filter and a booming voice. Entertaining in small doses, exhausting by closing time.
Usage examples
"Don't tell the loudmouth anything you don't want the whole office knowing by lunch."
"He's a bit of a loudmouth after two pints, you can hear him across the pub."
"Kev’s such a loudmouth he turned a quiet pint into a full public broadcast."
"She means well, but she’s a proper loudmouth when there’s gossip floating about."
Where it comes from
This one’s old and plainspoken in the best way. Loudmouth is recorded in English from the 19th century, built straight from loud and mouth. No mystery smoke, just a blunt label for someone who talks too loudly, too much, and often with way too little discretion.
