Sloaney

(British, informal) A fashionable young woman of the London upper classes.

(British, informal) Pretentious; posturing.

(colloquial, UK, Yorkshire) wet mud.

(colloquial, chiefly, _, Scotland) Posh, pretentious or stuck-up.

British informal adjective describing someone or something that is self-consciously affected, pretentious, or putting on airs — the social crime of trying too hard to seem sophisticated. A posey person might live in a painfully trendy flat, drop obscure cultural references into every conversation, or affect mannerisms borrowed from people they want to impress. Close in meaning to 'poncy' or 'posh,' but with an extra layer of performative effort baked in.