2. Fancy or elegant. (Exact definition.)
3. 'Stylishness.' This definition is implied from the song 'Puttin' on the Ritz,' which describes one trying to seem stylish, and then says, 'puttin' on the Ritz.' When it says, 'go to... where Fashion sits' before 'puttin' on the Ritz,' it's implying that wearing the latest fashion is related to Ritz, and that Ritz is largely based on your appearance. The song also mentions one trying to look like Gary Cooper, who was a popular celebrity at the time of the song's creation. 'Puttin' on the Ritz' evidently means 'dressing up stylishly.'
and you don't know
where to go to,
why don't you go
where fashion sits?
Puttin' on the Ritz.
Dressed up like a million dollar trooper,
trying hard to look like Gary Cooper."
~Fred Astaire - Puttin' on the Ritz
(adjective) something that has been Ritzed, or has the appearance of having been Ritzed, ie is rickety or broken or just hanging together by a thread.
(Derived from an ironic reference to the high-class Ritz chain of hotels).
Nick: "Doesn't matter man, we need to get this all sorted. Ritz that shit up"
Cory: "With gaffer?"
Nick: "Yeah man. It's in the safe."
Cory: "All done mate"
Nick: "Nice. That shit is hella Ritzy".
"Ritz", he rumbled.