실컷 + verb: 실컷 먹다, 실컷 자다, 실컷 울다
to one's heart's content, as much as one wants
Example
주말에는 집에서 실컷 자고 싶어요.
On the weekend I want to sleep at home as much as I like.
Good to know
Can be ironic: 실컷 공부했는데 시험이 취소됐어요 'I studied so hard and then the exam was canceled.'