bob's your uncle
Ha! While technically this phrase isn't "online jargon" because it originated in the 19th century, you will see it used often in online chat rooms.
"Bob's your uncle" is a British expression which means "everything's fine." It originated in 1877, when the British Prime Minister, Robert Cecil, appointed his nephew as Minister for Ireland. The press had a field day when he referred to the Prime Minister as "Uncle Bob." That's how "Bob's your uncle" became a popular phrase applied to sum up any positive situation.
NetLingo Classification: Online Jargon