Offcomm 

Abb. An abbrieviation for Offshore Communications

Relating, for example, to oil rigs and ships:"Mike, we gotta get some data back to HQ. What offcomm facilities do we have available to send the information?"

Offcomm by Gringol April 30, 2011

off-comm 

going dark, ending communication, or going private with the conversation

Giff, let's finish our lunch plans off-comm...I had a dream last night that 3 guys from the 80's were chasing me looking for their boombox...I'm afraid they might be listening now

off-comm by bpbpbpbp May 5, 2008