What does ‘Have a gander’ mean?

I believe this expression originates in the English county of Cheshire. The word relates to the way a goose (a male goose is called a gander) cranes its neck to look at something. As such a form of this expression ‘Have a goosey’ also exists, but is much more uncommon.

In context it works like this, ‘Come here and have a gander at what he’s doing.’