1. to facebook "poke" a friend while appearing to be offline.
2. to be facebook "poked" by a friend who appears to be offline.
Person A: "How is Pearce poking me? He's not even online."
Person B: "Dude, you're being ghost poked."
Person A: "How can I possibly win this poke war?"
Person B: "You could always go for the ghost poke tactic."