der Vollpfosten
idiot
A crude, colloquial insult for a person who is considered extremely stupid, incompetent, or slow on the uptake.
Dieser Vollpfosten hat schon wieder an der falschen Tür geklingelt!
That idiot rang the wrong doorbell again!

idiot
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idiot
A crude, colloquial insult for a person who is considered extremely stupid, incompetent, or slow on the uptake.
Dieser Vollpfosten hat schon wieder an der falschen Tür geklingelt!
That idiot rang the wrong doorbell again!

The word is made up of 'voll' (full) and 'Pfosten' (a vertical post). The metaphor behind it is that someone is as immovable and slow on the uptake as a thick post.
Ich kann nicht glauben, dass er das wirklich getan hat, so ein Vollpfosten!
I can't believe he really did that, what an idiot!
This is a very colloquial and crude insult. Use it only if you are aware of its offensive effect. It is completely inappropriate in formal or polite situations.
Er hat mich im Verkehr geschnitten, dieser Vollpfosten!
He cut me off in traffic, that idiot!
'Vollpfosten' (idiot) is often used as an exclamation with 'so ein' (such a) or 'was für ein' (what a). It can also be used as a direct, very impolite form of address.
Was für ein Vollpfosten, er hat den Schlüssel im Auto vergessen!
What an idiot, he forgot the key in the car!
idiot
'der Idiot' and 'der Vollpfosten' are both insults for someone you consider very stupid or incompetent. 'Der Idiot' is colloquial and strongly derogatory, but very familiar to many people. 'Der Vollpfosten' is even cruder and very colloquial. It is more suitable for angry or very casual conversations, but not for polite situations. Both words are hurtful; 'Vollpfosten' often sounds especially rude and mocking.

Wer bei Rot über die Straße rast, benimmt sich wie ein Vollpfosten.
Anyone who races across the street on a red light is behaving like a complete idiot.
Im Ärger sagte Lisa: „So ein Idiot, er hat einfach meine Tasche genommen!“
Angry, Lisa said, "What an idiot, he just took my bag!"