To not be able to be reached by standard means of communication (i.e. phone / email / txt) for a several hour period.
Bro, what happened to you last weekend, I couldn't track you down. Don't go dark on me again.
po sftron Јануар 9, 2008
1 more definition
To be outside communication range, especially after hours.
When the response team in Europe go dark, your call will be automatically rerouted to Australasia.
po yabbadabba Фабруар 24, 2008