noun
indulging in debauchery; giving oneself up to dissipation
A yojijukugo describing a state of being completely absorbed in self-indulgent pleasures, often with a negative moral connotation.
彼は若い頃、放蕩三昧の生活を送っていた。
In his youth, he led a life of dissipation.
放蕩三昧の日々が続き、財産を使い果たした。
Days of debauchery continued, and he squandered his fortune.