JO means: In Philippine English, JO refers to a government employee hired on a contract or job-order basis rather than as a permanent civil servant. JO workers are common in Philippine government offices - . 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.