Korean uses a LOT of onomatopoeia.
Onomatopoeia: A word, which imitates the natural sounds of a thing. It creates a sound effect that mimics the thing described, making the description more expressive and interesting.
For example in English: The wind whooshed past. The rustling leaves. (You see how we use a sound word to describe a thing?)
ANYWAY...Korean onomatopoeia are much more fun^^
Here's one you've already heard:
반짝반짝 means 'twinkle twinkle'
In context, it can mean glittering, sparkling, shining, twinkling, etc :)
Here are a few example of songs (this one is used a LOT in Kpop)
Rainbow - Sunshine Boy
Listen at 0:47
반짝반짝 빛나 You’re my SUNSHINE BOY
(ban-jjak ban-jjak bit-na)
(Twinkle, twinkle, you shine, you’re my sunshine boy)
SNSD - Gee
Listen at 1:18
너무 반짝 반짝 눈이 부셔
(neo-mu ban-jjak ban-jjak noon-i boo-shyeo)
(So bright/twinkling, my eyes are blinded)
Girls Day - Twinkle Twinkle
Listen at 1:20
슬쩍슬쩍 바라보지마 반짝반짝
(seul-jjeok seul-jjeok ba-ra-bo-ji-ma ban-jjak ban-jjak)