A common greeting in UK English having a similar meaning to 'How are You'
"Hi Dave, not seen you for a while, how's tricks?"
"Not too bad, thanks. I've been staying with a mate from out of town. How's tricks with you?"
Question one used to ask to hookers who "turn tricks." It means how are things? Or how is business? Now it is used in the UK for an alternative "how's things?" without any attachment to the old meaning.
Two friends passing:
"Good thanks, you?"
"Busy as always"