live high on the hog
US /lɪv haɪ ɑn ðə hɑɡ/
UK /lɪv haɪ ɑn ðə hɑɡ/

1.
to live in a very comfortable and expensive way
:
•
After winning the lottery, they started to live high on the hog, buying luxury cars and a mansion.
•
He inherited a fortune and has been living high on the hog ever since.