To take an unofficial day off work without any effective communication to the employer and with the employer not noticing one's absence.
"Mate, did you not go to work today?"
"No man."
"So did you call in sick?"
"Nah"
"Well what did they say?"
"Nothing. Pulled a total Ghostie man".
(hand movement similar to the '4' score in cricket can also be employed at this point.)
To ride a bike at full speed. then jump off of it, causing the bike to drift on its own (almost as if a ghost were to be riding it) before it's inevitable crash.
also known as a 'knight rider'
1."ooooh man, carl just ghostied his moutain bike into the neighbors car"