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1.
After inhaling smoke, holding it for an extended period of time, so when you exhale only a little amount or no visible smoke comes out of your mouth/lungs.

Useful for smoking weed when you don't want other people to be able to smell it.
You smoke weed in your dorm room?

Yeah, but I just use a one hitter and ghost hit it and still blow it out the window with the fan facing outward and popping popcorn.
by QWERTY1 April 23, 2006
 
2.
When somebody logs out and views your profile on Crushspot so their name won't be visible on your hit list.

It's usually an Admin and/or Stalker

But it is definitely a person that does NOT want YOU to know WHO they are!
CS user: I keep getting ghost hits!
Admin: We're working on it.
CS user: When?
Admin: We'll let you know.
by SilentVoice January 28, 2012
 
3.
When you inhale smoke from a cigarette, weed or any other smoke-able thing, and then passing it on to another person by blowing it mouth to mouth, into theirs.
Girl: hey give me a ghost hit?
Boy: sure *takes drag out of joint, puts mouth on girl's mouth and blows out*
by tikasumpter March 14, 2011
 
4.
taking a mouth hit of a ciggerette, joint, pipe, or any other smoking divce you open ur mouth some times u use ur tounge to push the smoke out then sucking backk all the smoke into ur lungs
just a fancy coolio trick
it kinda looks like a ghost hence the name
dude 1 "dude ghost hits are rad mann"

dude 2 "yeah its the only smoking trick i can do"

dude 1 "ur dumb dude"
by joe pot smoker August 17, 2007
 
5.
When smoking weed, managing to get a good hit from a bowl that is thought to be cashed by others.
Dude 1: "Don't bother, it's beat."

Dude 2: "Nah, man, there's gotta be a ghost hit in there somewhere."
by morteken October 02, 2008