Literally "precious sir" in Japanese ("ki" meaning precious, "sama" being a very polite honorific), it is what a samurai called his enemy. In modern speech, it can be used with someone you want to kill or as an extremely rude insult. Has been used by soldiers and yakuza. Sometimes used liberally by english-speaking otaku.
"kisama!"
"oh no you didn't!"
"oh no you didn't!"
by spazberry July 25, 2008