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When the IBM PC was first designed, it had no sound card, so the 'audible bell' character (ascii BEL or '\b') had to be linked to a tone emitted by the internal PC speaker. The designers chose C, and so a square-wave c emitted by a PC speaker is called a c-note.

The audible bell is typically used for indicating particular types of error conditions -- for instance, using backspace at the beginning of a line. It is occasionally abused by BASIC programmers, because of the 'BEEP' command (which emits a c-note). Audible bell characters are also printed during the BIOS setup routines on some older machines.
"I must have hung my vim session -- every key I press gives me a c note."
c note by enki 2 April 20, 2010
"C" signifying the quantity of 100 in roman numerals, "note" signifying federal reserve note, thus "cnote" signifies 100 dollars.
c-note by Carlos E. Fernandez April 27, 2003
A one hundred dollar bill. Derived from the Roman numeral for 100.
"He paid that bitch with a c-note"
C-note by Morpheus12 April 5, 2009
A $100 Bill.. Or if you are a chain smoker like me, you get C-Notes (Camel Dollars) off the back of the Camel Cigarette boxes.
Shit, if I collect 500 C-Notes I can get a free Camel "turkish Gold" T-Shirt
c-note by Hamydeez April 16, 2004
"Drink so much I cry liquor, wipe my tears with C-Notes, smoke so much weed, I fart weed smoke"
-Papoose - Ridin Shotgun
c-note by Shae Peterson November 19, 2005
A legendary CS player that went by the name of C-Note. He's a real bitch nigga
*C-Note spots his bazooka on the ground*

"OHH, NIGGA MY BAZOOKA! Nigga thats my bazooka right there... Hey cover me I'ma get my bazooka."

*C-Note is then shot in the head from an opposing teams member*
C-Note by TheRealC-Note February 20, 2010