Who actually says "Ale decha!" in Poland?

Saw this expression used last night in a new tv program ('Killing Eve'), where it's a clue in a murder investigation and eventually translated as 'flat-chested'. The show is set in London and the adult MI5 translator doesn't understand the term, but eventually a local Polish teenager does. I get that 'decha' is the larger/more emphatic form of 'deska'/board, so 'flat as a board' makes sense, but am just wondering if this expression is really in use now? In any particular age group or region? (NB: I grew up speaking Polish, but my vocabulary dates from about 1953, when my Warsaw-born parents left London after their army service and emigrated to the U.S., so it's kind of a time capsule. 😏) Thanks!

Both 'deska' and 'decha' are used in this context. It's not a particularly polite way of describing a woman. It's colloquial, too.

By the way, the way to describe a man as a 'wow' is 'ciacho'.

@kaprys
Thank you - and no, it was definitely not used politely in the show! 🙊

Sorry for digging this out but "decha" is not so commonly used, I'd say "Ale deska" instead.

I'd rather say "w dechė" (v deh-e) which would mean this is lit.

Ale deska means that's "she doesn't have any breasts" - "she's literally flat" like a wooden plate (deska).