This is the 6355th most frequent Polish word.
brzydula
An unattractive or ugly woman.
Here, 'Brzydula' is used as a proper noun, being the title of a specific television series.
Oglądałem wczoraj serial o nazwie 'Brzydula'.
I watched a TV show called 'Brzydula' yesterday.
Here, 'brzydula' is used as a noun to describe someone with physical appearance perceived as unattractive, and attention is drawn to the emotional impact of such labeling.
Nie nazywaj jej brzydulą, bo to może ją zranić.
Don't call her an ugly girl, because it might hurt her feelings.
In this sentence, 'brzydula' is used metaphorically and affectionately to describe someone perceived as temporarily unattractive.