Blue cheese dressing means: A salad dressing generally made of some combination of blue cheese, mayonnaise, buttermilk, sour cream, vinegar, garlic powder, and onion powder, commonly served with buffalo wings.. It is mainly Canadian English and may not be understood outside that context. 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.