adverb, adverb taking the 'to' particle
bustlingly; with a hubbub
Describes a lively, noisy, crowded scene where many people are moving about and talking. Often used with する or と.
祭りの会場はわっさわっさと人が集まっていた。
The festival venue was bustling with people.
駅前がわっさわっさして
The area in front of the station was so crowded and noisy that I couldn't move forward easily.