1. wigwag - Noun
2. wigwag - Verb
3. wigwag - Adverb
To signal by means of a flag waved from side to side according to a code adopted for the purpose.
Source: Webster's dictionaryThe wigwag is an antiquated type of railroad crossing signal which was phased out in the 1970s and 80s across the country. Source: Internet
Where this track crosses the main street in Point Richmond, there remain two of the last operational wigwag grade crossing signals in the United States, and the only surviving examples of the "upside-down" type. Source: Internet