A combo of the words "Japan" and "laser". A Japser is a weapon used in 2250. Japsers were created by the Japanese after Earth was taken over by the Irkens (ref- Invader Zim). First sed in GalaxyDancer's fanfic "Down Came The Rain" (www.fanart-central.net/stories.php?sid=11875)
"But it doesn't matter now, because I'm never going back. Ever. I will kill myself with a Japser first."