머리가 텅 비다

This idiom literally translates to 'one's head is empty'. '머리' (meori) means 'head', '가' (ga) is a subject particle, '텅' (teong) is an adverb indicating emptiness or hollowness, and '비다' (bi-da) means 'to be empty'. The expression vividly describes a state where one's mind feels devoid of content, often due to exhaustion, stress, or lack of inspiration. It can be used when someone is unable to think clearly, recall information, or come up with new ideas. The phrase has been in common usage for a significant period, reflecting a universal human experience of mental blankness. Its straightforward imagery makes its meaning easily understandable even without extensive linguistic context. The usage implies a temporary or situational state rather than a permanent cognitive impairment. It’s often used colloquially to express frustration with one's own mental state.