Top Definition
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."
by Rahtedpumpclart February 27, 2012

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