This is the 14782nd most frequent German word.
pfeifen
"To whistle" or "to pipe."
Here, 'pfeifen' means 'to whistle', indicating the act of producing sound using one's lips.
Die Kinder pfeifen ein fröhliches Lied.
The children are whistling a cheerful tune.
In this context, 'pfeifen' refers to the action of blowing a whistle, which is associated with referees signaling actions in sports.
Der Schiedsrichter pfeift das Spiel ab.
The referee is blowing the whistle to end the game.
Here, 'pfeifen auf' is a figurative phrase meaning 'to disregard' or 'to not care about', showcasing idiomatic usage.