Chibi is a Japanese word meaning "short person" or "small." The word has gained currency amongst fans of manga and anime
hentai.
Its meaning is of someone that is small. It can be translated as "little," but is not used the same way as chiisana (tiny, small, little in Japanese).
A prototypical example of the former usage in the original Japanese which brought the term to the attention of Western fans is Chibiusa, a pet name
for the diminutive daughter of Sailor Moon formed from Chibi Usagi. In English-speaking anime fandom (
otaku), the term chibi has mostly been conflated
with the term super deformed
hentai anime.