(as) thick as two short planks

US /əz θɪk əz tuː ʃɔrt plæŋks/
UK /əz θɪk əz tuː ʃɔrt plæŋks/
"(as) thick as two short planks" picture
1.

dumm wie Bohnenstroh, strohdumm

very stupid

:
He's (as) thick as two short planks, he never understands anything.
Er ist dumm wie Bohnenstroh, er versteht nie etwas.
You'd have to be as thick as two short planks to believe that story.
Man müsste dumm wie Bohnenstroh sein, um diese Geschichte zu glauben.