meshiuma
Meshiuma (メシウマ） is a Japanese slang word originating from 2channel, which is a shortened version of 他人の不幸でメシがうまい (tanin no fukou de meshi ga umai), whose meaning is "Other people's misfortunes make the food tasty", which is a metaphor for "getting aroused from the misfortunes of others", thus it's the Japanese word for "schadenfreude".
交通事故やのに何でコイツ笑ってんの？メシウマか？
KOUTSUU JIKO YANONI NANDE KOITSU WARATTEN NO? MESHIUMA KA?
Even though it's a traffic accident, why is he laughing? Is he shadenfreude?