What it means
A handy little phrase that works two ways. As an interjection it means hold on, wait a minute, or hang on, usually because something doesn’t sound right and you’re about to question it. It can also mean to loiter or linger somewhere with no real purpose, just mooching about and killing time.
Usage examples
"Hang about, I thought you were skint. Why you rolling up in a taxi with a kebab and a new vape? That maths ain't mathing, mate."
"We just hung about the precinct all afternoon with nothing to do."
"Hang about, that is not what you told me yesterday."
"Hang about, you said you were done with him last week. Why's his hoodie still on your sofa then?"
"We were just hanging about outside the chippy till Jay finished his shift."
Where it comes from
This is old English, proper everyday stock. The loitering sense goes back centuries and grows from the plain idea of staying or lingering around a place. From there, the interjection Hang about came out naturally as a quick verbal brake, basically telling someone to pause because something's off.