"Keep The Flemish", evolved from #ktt (keep the typo).

Whenever someone (who may or not be from Belgium) makes a typo and/or spelling mistake, that person is ripe for mocking by shouting "Nice Flemish!".

To avoid ridicule, the maker of the mistake can pre-emptively acknowledge their mistake by adding #ktf.

Kes ke tu fais?
Qu'est-ce que tu fais?
What are you doing? But in french.

1. Acronyme pour ''Kes tu fait?'' (qu'est-ce que tu fais).

2. Acronyme très utilisé par les fuckboys de Montréal et Laval pour faire un ptit quickie

A shorter term for “kill them first”.