(adjective) Behavior that seems to be noisy, energetic, cheerful, rowdy.(Lexico.com)

Ive encountered this word while reading this weeks weekly reading by Williams, I K. “36 hours in Yokohama”

Join the local after-work crowd at Hanamichi, a boisterous standing bar on the B2 level of the Pio City building.(Williams, I K.(2019))

In this sentence, the word boisterous is used to describe how high energy and cheerful this bar is to the local area.