It started as a joke because a person at the office wasn't curteous enough to say "good-bye."
Our sports reporter, W., then asked me how to say it in Swedish.
"It's 'hej då!'" I said.
He paused at the door.
"Hej da!" he said, waving to the newsroom staff.
"No, no," I said, "it's more like 'dough.'"
"Hey DOUGH!" W. yelled.
A few days later, Albie caught on.
"Hej då!" he yelled as W. was leaving for the night.
Then a couple of the reporters caught on. And now, we're all hejdå-ing.