C-- 

A fancy name for assembly language. It forms a chain:

C-- => C => C++ => C#

Mike: "What's better, C,C++ or C#?"
Steven: "Obviously C--, the lower the level of the language the better"

C-- by Frikiboss June 19, 2021

c!

c! Is used most commonly by Dream SMP fans (mostly on twitter) to define someone on the Dream SMP's Character.

C! Is just an abbreviation of canon/canonical.

When using c! one is referring to a character rather than the person portraying said character.

c!Ranboo is very forgetful.
While Ranboo is probably not as forgetful as his canonical self.

c! by Loousir June 6, 2021

:C 

The saddest man in the whole entire world.

the burden of the whole entire world is on my shoulders :C

:C by Fantastic Johnny C April 26, 2005

C- 

The majority of one's transcript should they opt into their local college of engineering.

I was certain I failed that Calculus III course, but thanks to the powers that be, I was blessed with a C-.

C- by Prometheus McSpanky April 18, 2014

/c/ 

Anime/cute section of 4chan. Calm and sporting a slow post rate, /c/ is a novelty compared to the other boards. Mainly an imageboard meant for posting images of anime/videogame girls that are cute/moe in nature.

"Wow, /c/ is on its way to its one millionth post! Sure took it long enough..."

"Gee, Bill! How'd you get so many pictures of Konata Izumi?"
"I found them on /c/."

/c/ by Iron Ladle May 26, 2009

C 

C is for cookie, that's good enough for me.

when you take a bite from a cookie, it looks like a C

C by the real cookie monster July 27, 2005

c: 

Simply a cute smile

A: I'm happy to see you again
Z: Me too c:

c: by Fainspirit November 5, 2018