Raise unshirted hell means: A US intensified form of the idiom raise hell, meaning to cause extreme chaos, protest loudly, or create a major disturbance. The unshirted intensifier takes the already strong raise hell to a. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.