In aid of means: for the sake of, for (usually placed at the end of a question when quizzing a person about why they have done something).. It has drug-related associations; worth a calm conversation about which side of the topic your teen is on. As a place or proper-name reference it is purely descriptive. 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.