"I'll be shot" means: A dated mild oath of surprise or disbelief — essentially a softened stand-in for something stronger. If someone told you shocking news and y.... This is a fairly neutral word with no inherent risk attached. There is no real cause for parental concern; it is descriptive vocabulary rather than something dangerous. If your child uses it, context will usually make the meaning clear. A brief, curious question about where they heard it is generally enough to know whether to follow up.