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What is shell casing?
Slang for being extremely busy, having been extremely busy or both.
Busy person (picking up phone): "What !?! This had better be good! I am skating on shell casings here, you know!"
Caller: "The boss wants the names of who we are sending to the hazardous materials training."
Busy Person: "Yeah, I'll get right on that"
shell casing - video
Shell casing - what is it?
Q. "Where'd you put the shell casing?"
A. "Lol, you me to put it in your bag and I cracked up and did it."