An insult. When someone makes a spelling error, they can be poked fun at by being called a "JS".
Person 1: Hey their, hwos it goign?
Person 2: HAHAHA, YOU JS
Jewel Suicide
A way to cheat in gunbound, to earn money and GP (for ranking).
my god, you couldn't even hit him! YOU MUST BE A JSer!
Abbreviation of the Japanese phrase, "joshi shougakusei" (女子小学生) meaning, "female elementary school student." You will occasionally find it in the titles of loli doujinshi.
"I wonder why JS is so much less common than JC or JK..."
"Maybe because most people don't want to masturbate to girls that little, fuckin' deviant maniac pedophile bitch."