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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.
by thx to kaeru March 25, 2008
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Jul 26 Word of the Day
Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed
I got a call from X the other night. She had an extra ticket to a concert she bought for a friend, but they couldn’t make it so she called me to ask if I wanted to go because I am her Second String Friend.
by Deus-ex-machina August 26, 2020
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2
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.
by Tym October 07, 2003
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3
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!"
by DR. DAVIS December 10, 2004
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5
short for "keep texas brutal!"
tanner: hey are you going to that show tonight?
tyler: hell yeah dude i gotta "KTB"
by tyler smeast April 18, 2009
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6
The abbreviation for a KFC-Taco Bell.
Shall we hit up the KTB before the game?
by bob November 20, 2004
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