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1.
An acronym, similar to RTFM, being made popular in help desk and technical support workplaces. Stands for Check The F**king Cable.

Used when someone calls for help, claiming up and down that an item is broken and immediately needs to be replaced, when it was simply unplugged.
"This scanner is broken, I demand a new one!"
"CTFC"
by [42]Sanford August 27, 2006
 
2.
CTFC is an abbreviation for Change The Fucking Channel. Or in other words if you don't like something on TV then don't watch it. This should be directed toward a self righteous asshole who wants something pulled from TV because it offends them.
The Parents Television Council should learn to CTFC
by JK1776 March 09, 2011