also: ベルさっさ
noun
rushing off as soon as the bell rings; leaving immediately at the bell
Dated colloquial noun describing the act of leaving or rushing out the moment a bell rings, especially at school or work. Often implies eagerness to leave.
See also: さっさと
彼はいつもベルサッサで、授業が終わるとすぐに教室を出ていく。
He always rushes off as soon as the bell rings, leaving the classroom the moment class ends.
ベルサッサの社員は、定時になるとすぐに帰ってしまう。
Employees who rush off at the bell leave right at quitting time.