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1.
What you say when somebody asks you "what's up" in a room. Usually said to piss someone off.
"Hey man, what's up"

"ceiling."

"WTF? you suck shit man!"
by BLEHMAN223 May 18, 2010
 
2.
an entry point to a room for those...of special intelligence, or of great altitude and velocity.
dude...the Retard just "dropped" in...through the ceiling!
by ranger bill May 20, 2008
 
3.
What your wife is contemplating changing the color of while you have sex with her.
Becky considered 7 possible color changes to the ceiling during the 42 seconds that her husband spent "making love" to her.
 
4.
an upper limit to something
He proposed putting a 3 hour ceiling on gaming time.
by The Return of Light Joker April 06, 2009