(as) thick as two short planks
US /əz θɪk əz tuː ʃɔrt plæŋks/
UK /əz θɪk əz tuː ʃɔrt plæŋks/

1.
정말 멍청한, 아주 바보 같은
very stupid
:
•
He's (as) thick as two short planks, he never understands anything.
그는 정말 멍청해서 아무것도 이해하지 못해.
•
You'd have to be as thick as two short planks to believe that story.
그 이야기를 믿으려면 정말 멍청해야 할 거야.