This is the 1822nd most frequent German word.
pfosten
Post; stake; upright supporting structure.
Here, 'Pfosten' is used to mean a literal physical post, such as in sports where it refers to parts of the goal.
Der Fußball prallte gegen den Pfosten und zurück aufs Spielfeld.
The soccer ball bounced off the post and back onto the field.
In this sentence, 'Pfosten' is used metaphorically as a term for someone considered clumsy or not reactive.
Er nannte ihn einen Pfosten, weil er ungeschickt war.
He called him a post because he was clumsy.
Here, 'Pfosten' denotes the structural posts used to support a fence.