A term used by
Keith Richards of The
Rolling Stones. Richards wouldn't go onstage until he had ritually sank a knife into the crust of a fresh shepherds pie. Should someone dig into his pie, he would become hostile and uncooparative until a new one was sourced.
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.
"
I'm telling you man, i'm
pissed off already, don't bust my crust." "Well get off of my cloud then man!"
"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."