Why do people say salty all the time in Twitch chat for LCS?

Turns out the saying is older than you think! From the Cab Calloway Hepster's Dictionary first compiled in 1938.

http://www.dinosaurgardens.com/wp-content/uploads/2007/12/hepsters.html

Scroll down for "salty." Earliest known usage. From there, it extended to the urban youth until some gamer heard it, thought it sounded cool and introduced it to the gaming scene, where it caught on.

The More You Know...