This is the 14365th most frequent Polish word.
przegina
"Przegina" in English means "overdoes it" or "crosses the line."
The usage of 'przegina' here refers to exaggerating or taking something too far.
On czasami przegina z żartami.
He sometimes goes overboard with jokes.
In this instance, 'przegina' is used to request someone to refrain from excessive behavior.
Nie przeginaj, proszę.
Don't overdo it, please.
'Przeginasz' is applied here to indicate that someone is being unreasonable or exaggerating.