Genit is one of those words in the Indonesian language for which there is no easy translation available. Genit is an adjective that describes a girl or woman (and occasionally also a male person) who acts in an unusual way to attract the attention of usually the opposite sex. Possible translations are ‘coquettish’, ‘flirtatious’, ‘whimsical’, ‘kittenish’, ‘playfully coy’, and ‘fanciful’.
The KBBI (Kamus Besar Bahasa Indonesia) defines genit as bergaya-gaya ‘to show off in a stylish or playful way’, and as banyak tingkahnya ‘a girl of many whims’. And yes, genit is a combination of the two definitions.
Here’s a video of a toddler behaving in a genit way: