ktb 

Shortening of kthxbye, which is in turn a shortened form of "k thx bye". The K is short for OK, which is short for "oll korrect", which is a facetious alteration of "All Correct". Thx is short for "thanx" which is a facetious alteration of thanks which is short for "Thank You". "Bye" is short for goodbye, which is an alteration of "God Be With You". "ktb" is the pinnacle of English's advancement, shortening "All correct, Thank you, God be with you." into three letters. Humanity is doomed. Obviously, it is used to end a conversation *fast* that you don't want to be in anymore.

Whiny bitch: Here's your hamburger. Anyway, as I was saying about how bad my life is...

Other dude: Yum, burger. ktb. *leaves*

Whiny bitch: I have no friends. Wan wan wan.

ktb by thx to kaeru March 25, 2008

KTB 

abbreviation for "Kut Throat Bill" A Florida/Pompano Hip-Hop Brand started by local Kodak Black aka. Bill k Kapri.
the abbreviation can be used in multiply ways though just like with S.G (sniper gang), KTB can be an abbreviation for whatever he feels fit at the moment.

KTB Kut throat bill

KTB by TTDBenz August 26, 2022

ktb 

an abbreviation for wordkthxbye mostly used in losing an argument or just to sound cool.

A: I'm sure I'm right though...
B: but i still w1n ktb.

ktb by Tym October 7, 2003

ktb 

Kill that bitch or kill this bitch.

"and the shit really hit the fan when she kissed him back."
"Man you need to ktb."
"Ya, ik!"

ktb by DR. DAVIS December 10, 2004

KTB 

"Killing the Bugs"

Ugh, so many mosquitoes in the room KTB.

KTB by Bug Killer September 28, 2009

ktb 

short for "keep texas brutal!"

tanner: hey are you going to that show tonight?
tyler: hell yeah dude i gotta "KTB"

ktb by tyler smeast April 18, 2009

ktb 

The abbreviation for a KFC-Taco Bell.

Shall we hit up the KTB before the game?

ktb by bob November 20, 2004