Chobi chobi

Chobi chobi is used when someone does/uses something a little by little, not to do/use whole thing in one time.
syn: chibi-chibi, chobo-chobo

i.e)
Jp: Kono Godeiba no chokoreito ha totemo takai node CHOBI CHOBI tabeyou.
　このゴディバのチョコレートはとてもたかいので、ちょびちょびたべよう。
En: This Godiva's chocolate is very expensive, so eat it little by little.

Chika chika

Chika chika is used when someone is dazzled by strong light, picture etc.
It could also used when the light is blinking.(e.g. pedestrian light for crossing).

i.e)
Jp: kamera no furasshu de me ga CHIKA CHIKA shita.
　かめらのふらっしゅでめがチカチカした
En: I was dazzled by the camera's flash.

Jp: shingou ga CHIKA CHIKA shiteiruyo. isoge!
　しんごうがチカチカしてるよ。いそげ！
En: That light is blinking. Hurry up!