To suddenly stop responding while in an instant message conversation with someone. Is used best when incorporated into existing sentences.
To qualify for an official Rog, there must be at least 5 minutes of silence from one party. To prevent a Rog, one can simply say 'brb'.
Rhett (8:30): Haha yeah.
Matt (8:31): Did you see The O.C. last night?
Matt (8:36): Well?
Matt (8:38): omg rog.
Matt (8:44): Did you read ROGer ebert's review in the paper this morning?
Matt (8:50): Ghost ROG: The way of the samurai