After winning the lottery, he became a beggar on horseback, spending money recklessly.
После выигрыша в лотерею он стал нищим на коне, безрассудно тратя деньги.
Definitions
A person who is in a position of privilege or wealth but behaves in a manner that is needy or ungrateful, often used to describe someone who forgets their humble beginnings or acts entitled despite their current status.