In motorcycle stunting, pulling a wheelie so high that the bike rests on the it's tail section is called a "twelve o'clock". The act thereof is called "twelving".
When you're with your group of friends and they all start cornering you by being annoying, twelving is the perfect word to use.
It was a play on words to mean annoying. Since 'twelve' in Korean is shipi (십이) and 'annoying' is shibi (시비), it was a clever way to combine the two for a whole new word. (Credits to Koreaboo)
The act of updating your twitter status while driving down the road and inadvertently swerving and weaving, in and out of your lane, as though you were intoxicated without a care in the world.
Bobby Joe, tired and bewildered after a long day at his job, realized another clever observation on his gridlocked commute home.
Grabbing his iPhone, Bobby Joe began a historic tweeving run, nearly running 3 vehicles and a motorcycle off the highway as he tweeted, "I'm tired, bewildered and commuting in the WORST traffic! No way I get home and see Dancing with the Stars in time. Time to get Tivo."