That Was Kinda Funny. Used as an alternative to lol, which means Laughing Out Loud. However, lol is often used when the person would not actually laugh out loud, causing a certain amount of unwanted hypocrisy. To circumvent this, TWKF can be used instead.
"I used to own a SNES."
"Super Neat Electric Snail?"
As you can see, the use of lol would have been hypocritical. Using TWKF prevented this.