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OMCC (Oh My Ceiling Cat) 

A term used by those 2 out of 3 lol cats that believe in Ceiling Cat and do not believe in Christianity's "God", therefore they do not use the term "OMG" a.k.a "Oh My God".
"OMCCWTFBBQ! A Capshun!" said the lol cat on icanhascheezburger.com

"OMCC (Oh My Ceiling Cat) thats one funny lol cat"

holy ghost in my ceiling

When your cat looks at your ceiling randomly and starts howling demonic chants by opening and closing its mouth.
I was typing an essay , and my cat started started staring at the ceiling. Clearly, there was a holy ghost in my ceiling.

ceiling of my mouth 

The upper portion of the inside of the mouth. More commonly and incorrectly referred to as the "roof" of the mouth. This doesn't make sense because it's inside, like a ceiling, not outside, like a roof. The scalp and hair are the roof of your head, and your mouth has a ceiling.
Jim: "Hey Dan, want some tortilla chips or some Captain Crunch?"

Dan: "No thanks. Last night, I made a pizza in the oven, and like an idiot, I bit into a piece right away. The hot cheese burned the ceiling of my mouth. It hurts. I need to eat apple sauce for a few days".
ceiling of my mouth by orangek July 20, 2011