J-Girl Nihongo Watch

GIZA = a new slang prefix that basically means "very, very...!"

Commonly used by high school girls with such words as "kakkoi" (cool) or "oishii" (delicious).

My source tells me it comes from "giga" as in gigabyte but the first person to attempt to use the word mistakenly said "giza" instead of giga and it stuck.

Whether that's true or not... it's giza-cool!