싱숭생숭해요 · 싱숭생숭했어요 · 싱숭생숭한 (+noun)
to feel restless, fidgety, unable to settle (often from spring or excitement)
Example
봄이 오니까 괜히 마음이 싱숭생숭해요.
Now that spring's here, I feel restless for no reason.
Word parts
Playful rhyming mimetic word; the bouncing sounds mirror a fluttering, unsettled heart.
Good to know
Lighter than 뒤숭숭하다: often a pleasant, distracted restlessness, especially in spring.