Geggery means: A Scottish archaic term for trickery, deception, or conjuring tricks. The word suggests sleight of hand, illusion, or dishonest manipulation. Now entirely obsolete and encountered only in historical. The word is mostly archaic or historical; you will only encounter it in old texts, period drama, or school history rather than current teen conversation. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. This is a food-related word and harmless in itself.