What does it mean when a guy calls a girl "trouble"?

[no_other_road]

When a guy says something like "Hey Trouble" or "You're trouble" just out of nowhere, does it mean anything? Or is it just a saying?

[windyone]

Everytime I have heard that term it was used to a girl who was a trouble maker like a party girl etc.

[Lacutis]

It means you challenge him, and he likes it.

[surfshop90]

it means that he is flirting with you.