It means
Chill The F*** Down, or Calm The F*** Down, usually used when one person gets mad at something
simple, which wasn't meant to
insult. Also used to calm someone down before a Beef.
#
1 "Dude, Stace went to the Movies with Robert"
#2 "WHAT?!?!?!?"
#
1 "Dude, CTFD she went with her Posse"
"Yo mamma so stupid she put
paper on the television and called it paper view!"
"What you say 'bout my mamma?!?!"
"CTFD, It was a harmless joke"