This meaning describes places, products, or experiences that appear refined and costly.
They stayed in a posh hotel.
The restaurant looks too posh for a casual lunch.
This meaning describes people, speech, behavior, or environments associated with wealth and upper-class status.
He speaks with a posh accent.
She grew up in a posh neighborhood.
This rare informal collective use refers to wealthy or upper-class people.
The club attracted both students and local posh.
The satire mocks the habits of the posh.