What is THX?

it means Thanks. it's also some sound company or something...um.

Bastardization of 'Thnx,' which is a bastardization of 'Thanx,' which is a bastardization of 'Thanks,' which is a bastardization of 'Thank You.'

http://www.urbandictionary.com/define.php?term=thx

When I use it means Thanks! I really appreciate your kindness! Would you like my watch?

Thanks,
or if you want to get technical:

"THX is the trade name of a high-fidelity sound reproduction standard for movie theaters, screening rooms, home theaters, computer speakers, gaming consoles, and car audio systems. THX stands for Tomlinson Holman's eXperiment. THX was developed by Tomlinson Holman at George Lucas's company Lucasfilm in 1982 to ensure that the soundtrack for the third Star Wars film, Return of the Jedi, would be accurately reproduced in the best venues."

http://en.wikipedia.org/wiki/THX
http://en.wikipedia.org/wiki/Tomlinson_Holman

Thanks

if you mean as an abbreviation i think it means 'thanks'.

In the Lucas film, "THX1138", it stood for "Thermal Transfer" which was the occupation of the primary character, who was named, incidentally, THX1138. THX workers regulated the temperatures of regions of their habitat, which was regarded as a prestige duty.

"THX usually refers to THX The sound-system standard promulgated by Lucasfilm. THX may also refer to:

In television and film:
- THX 1138 - George Lucas's first feature length film.
- Electronic Labyrinth: THX 1138 4EB - Short film by George Lucas.
In other uses:

- thx - The online chat abbreviation, "thx" List of Internet slang phrases" (thanks)
Source:
http://en.wikipedia.org/wiki/THX_%28disambiguation%29