히히 + 웃다
hee-hee (cheeky giggle)
Example
동생이 장난을 치고 히히 웃었어요.
My little brother played a prank and giggled 'hee-hee'.
Word parts
의성어 (sound word) for a cheeky, mischievous giggle, typical of children.
Good to know
Adults use it mostly in texts to sound playful or soften a tease.
Related words