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.
ayon kay sftron ika-09 ng Enero, 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.
ayon kay yabbadabba ika-24 ng Pebrero, 2008