This is the 8753rd most frequent Russian word.
пискун
"Пискун" refers to a "squeaker" or "chirper," often used for small animals or a person who squeaks or chirps.
Here, 'пискун' is used colloquially to refer to a small child or infant who frequently squeaks or makes sounds.
Маленький пискун начал плакать, требуя внимания.
The little squeaker started crying, demanding attention.
In this sentence, 'пискун' is used as a nickname or descriptor for someone known for having a high-pitched voice.
В школе его прозвали пискун за высокую тональность голоса.
At school, he was nicknamed 'squeaker' for his high-pitched voice.
In this case, 'пискун' refers to a type of animal, likely a frog or insect, known for making squeaky sounds in its habitat.