This is the 6187th most frequent Polish word.
bwa
"Bwa" is not a standard Polish word and does not carry a recognized definition in Polish.
The usage "bawić się" in reflexive form shows enjoyment or having fun.
Za każdym razem, gdy jestem w tej okolicy, bawię się świetnie.
Every time I'm in this area, I have a great time.
In this phrase, "bawić się" indicates the act of playing, often used with children.
Dzieci bawiły się na placu zabaw przez wiele godzin.
The children played on the playground for many hours.
Here, "bawić" without reflexivity (not reflexive) reflects finding something entertaining or amusing.