Acoustic check means: A casual call-out or moment of verification when someone suspects they're dealing with the 'acoustic' version of something - a person, a take, or a situation. Doing an acoustic check means briefly. It has drug-related associations; worth a calm conversation about which side of the topic your teen is on. 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.