There’s an interesting idiom in British English that means that you are bad at doing something – you can’t do it for toffee. Apparently a US equivalent is can’t do something for beans.
The equivalent of this phrase in French is il n’est pas fichu de faire qch and in Welsh it’s nid yw’n medru gwneud rhywbeth am ffortiwn.
Are the similar idioms in other varieties of English, and in other languages?
How about “you couldn’t pull the skin off a custard” and “you couldn’t organise a pissup in a brewery”?