expression, noun which may take the genitive case particle 'no', noun
as one pleases; doing whatever one wants; free-for-all
Often carries a negative nuance of selfishness, lack of restraint, or irresponsibility. Used as a noun or with の to modify another noun.
彼は会社でやりたい放題やっている。
He does whatever he pleases at work.
やりたい放題の生活を送っていると、後で後悔するよ。
If you live a life of doing whatever you want, you'll regret it later.