Now often used in a threatening way to cut short an argument before a fight ensues, akin to saying 'don't piss me off'. Also known to have been used as a warning to encourage an individual to get off of ones case.
"Ok i'll do it, geeze woman, don't bust my crust!"
*Mick Jagger on seeing some pie missing - "Do you know the rules? You never, ever, take the shepherd's pie unless Keith's broken the crust first."