adverb, adverb taking the 'to' particle
slithering; wriggling
Describes the smooth, slippery movement of something like a snake, eel, or wet noodle. Often used with と or as an adverb.
ヘビがにゅるにゅると草むらを進んでいった。
The snake slithered through the grass.
うどんがにゅるにゅるしていて、箸でつかみにくい。
The udon noodles are slippery and hard to pick up with chopsticks.