Go dark 

To be outside communication range, especially after hours.

When the response team in Europe go dark, your call will be automatically rerouted to Australasia.

Go dark by yabbadabba February 24, 2008

go dark 

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.

go dark by sftron January 14, 2008

go dark 

To lose all moral restraint and retaliate against someone with a cold and brutal detachment.

"If Paul doesn't stop screwing with me I'm liable to go dark on his ass!"

go dark by on September 30, 2019

go to the dark side 

To use software produced by Microsoft Corporation.

go to the dark side by magicianblade December 25, 2002