Skimmery means: St Mary Hall, Oxford, England, a medieval academic hall of the University of Oxford, incorporated into Oriel College in 1902.. 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. It is an education-system term, so usage is institutional and routine.