Fart in someones face in the dark. When you do this, that person has just been Ghost Whispered.
If someone goes to bed before you, wait until the lights are off. Creep into the room, stand as near to their head as possible and fart. The Ghost part is doing it in the dark, the Whisper part is the fart.
If they find out, let them know, "You have just been Ghost Whispered!"
When taking a shit you wipe to reveal no excrement present. However this word has two parts when taking a shit you glance in the toilet bowl to reveal no evidence of you having a shit at all. The perfect ghost shit requirs that both criteria mentioned above are met.