It means party in Tamil.
That has no meaning in English, try eastern languages.
Oh, dude, "katchi" in English means "raw" or "uncooked." It's like when your friend tries to serve you a half-baked idea, you can be like, "Nah, that's totally katchi, bro." So, yeah, it's all about things being uncooked or not fully developed.
Perunthalaivar Makkal Katchi was created in 2011.
Makkal Manadu Katchi was created in 2006.
Hindu Makkal Katchi was created in 1993.
Tamil Desiyak Katchi was created in 1995.
Pattali Makkal Katchi was created in 1999.
Viduthalai Chiruthaigal Katchi was created in 1972.
All India Samathuva Makkal Katchi was created in 2007.
Ahila India Naadalum Makkal Katchi was created in 2009.
katchi
Perween Rahman has written: 'Katchi abadis of Karachi'