A sound that is made that sounds like "burnt", but is used when someone injures themselves, is on the receiving end of an unfortunate circumstance, or when someone is shut down on the internet by kill shot comment.
*seeing person running from the Police, then trips and falls* Onlooker: "brnt"
*Fabio gets hit by a bird on a rollercoaster* "brnt"
*recieves offer for unsolicited dick pic on public forum*
replies "Should one day I recieve a million phallic photos by post, yours would be the only one I'd RTS"
"brnt"