Il parle anglais comme une vache espagnole.

English Translation

He murders English.

“He speaks french like a ‘Basque Espagnole’.”
This sounds like ‘vache espagnole’.
Basque is not related to other European languages,
So a basque from Spain has really weird french.

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Just to add onto this, allthough it seems it might have something to do with basque people, the idiom is very much about cows

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English Translation

He murders English.

Yes. It is very similar to saying “vachement” instead of “vastement”.