Phrase name means: An informal name given to a plant taxon that has not yet been given a formal scientific name. It consists of the generic name, "sp." (to indicate it is a species), a geographical or morphological. 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.