N. A combination of "snack" and "tactics"
Any strategy employed in order to discreetly sneak a clandestine drink during a class, lecture, board meeting or other function where alcoholic drink is not allowed or not available.

A common snacktic involves threading a thin plastic tube via one's sleeve into a hip flask containing a spirit, or other alcoholic beverage.

The term "having a snack" is very popular in universities, where students rely on good snacktics in order to fuel their appetite during lectures, in preparation for a solid evening's drinking in their local.