2.A state in which reality and fiction are indiscernable from the other.
3.Being totally awesome, a trend-setter. One who gets all the ladies. One who is secretly as shallow as Shallow Hal, but also a romantic like Danny Deckchair.
The original Haldan, Haldan Jacobsen, was a prominent social figure, popular in the trailor-trash hick-town known as Belding, MI. Once a local writer, Haldan wrote a lot of fiction, which drove him mad, because he soon began to believe that what he thought was a reality. If he thought that it was accepted to barter with the workers at the local Leppinks, he did it, and "Haldan-ing" soon became a fast-growing trend.
"Dude, did you just fart in front of Laura?"
"I don't know dude, take a whiff."
"Dude, Haldan gets all the ladies...."
"Yeah, fuck him."
"No man, I'm straight."