wigwag(noun, verb) noun1. Any of a number of mechanical or electrical devices which cause a component to oscillate between two states. verb1. send a signal by waving a flag or a light according to a certain codeDefinition categories: contact, brandish, flourish, wave2. signal by or as if by a flag or light waved according to a codeDefinition categories: communication, sign, signal, signalise, signalize