(US, slang) To declare (chiefly in first-person present constructions).
Esimerkit
He swans around that stinking office in his expensive clothes that are a little too tight for comfort, he swans around that stinking office without a care in the world.
One of the few strokes of good luck Emma had had in recent days was the news that Tatiana Flint-Hamilton, her only real rival for top billing as 'most photographable girl' at today's event had decided to swan off to Sardinia instead, leaving the limelight entirely to Emma.
"Well, I swan, man, I had a better opinion of you than that."
‘She slammed the door so hard I figured a window'd break [...].’ ‘I swan,’ I said.