Game "Synonym"

[someone]

Strike gold

[Juliemiracle]

to be well-off

[QwestDay]

to be better off (than ...)

[Easy-Breezy English]

fat cat

[Juliemiracle]

to be stinking rich

[Easy-Breezy English]

high baller

[Juliemiracle]

to be made of money (usually negative)

[tourist]

sugar daddy ))
if you're not into them
then
just find a younger man,who has money to burn

[Juliemiracle]

to live like a king

[Роман Молти]

to live high off the hog

[Easy-Breezy English]

sugar daddy

Ответим Чемберлену, чё:
sugar momma
+
make a killing

[tourist]

I see your sugar momma and raise you moneybags )
btw, make a killing has been stolen from #39

[Juliemiracle]

live in the lap of luxury

[Easy-Breezy English]

make a killing has been stolen from #39

Uh-ho.
Ok, a substitute:
to be popping rubberbands

But that's kind of trashy, so I'm not sure it qualifies.

[Juliemiracle]

Easy-Breezy English,
isn't it more like 'to spend money'?

[tourist]

rubber bands is good,
but not as good as
flush with cash

[Easy-Breezy English]

Easy-Breezy English,
isn't it more like 'to spend money'?

I think it's fairly new, so it can be used in more than one way.

In 2018, Cardi B helped popularize the expression poppin’ rubber bands when she rapped it on Bruno Mars’s song “Finesse”: “I went from dollar bills, now we poppin’ rubber bands.” The image is that she’s earned so much money from her small-bills that they make rubber bands pop, unable to hold the stack together.

Poppin’ rubber bands — When you have so much money that a rubberband can’t hold it all.

[Easy-Breezy English]

nob/nabob

Actually, San Francisco's Nob Hill made me think of this.
Prior to the 1850s, Nob Hill was called California Hill. It was renamed after the Central Pacific Railroad's Big Four — called the Nobs — built mansions there. The slang term "nob" means rich or wealthy.

BTW, it's also called Snob Hill.

[Mary May]

well-endowed

A word of warning:
To be ob a safe side, it's better to use the adjective with companies, firms, etc, NOT with people (unless you really mean sth other than just "being rich").

[someone]

Hit pay dirt

[Juliemiracle]

have money to blow

[diggerzz]

to be a big spender

[Easy-Breezy English]

ride the gravy train

[Mary May]

Be/live in clover

[QwestDay]

To be a millionaire, multi-millionaire, billionaire
Go from rags to riches