"he s as thick as two short planks" in German He's as thick as two short planks. Er hat ein Brett vorm Kopf. Er ist dumm wie Bohnenstroh. Detailed translations for "he s as thick as two short planks" He's as thick as two short planks. 1. colloquial He's as thick as two short planks. Er hat ein Brett vorm Kopf. 2. figurative He's as thick as two short planks.(also: He is as dumb as a post.) Er ist dumm wie Bohnenstroh.