What does cockle mean in English slang?

"Cockle" is not commonly used as slang in English. It's a word with a few different meanings, none of which are considered slang:

* A type of edible shellfish: This is the most common meaning.

* To wrinkle or pucker: This is a less common usage.

* A type of heart: This is an archaic usage, referring to a type of small, fleshy organ.

It's possible that "cockle" is being used in a slang context in a particular region or subculture, but it's not a widespread slang term. If you can provide more context about where you heard this word, I might be able to give you a more specific answer.

It's also possible that you're thinking of a different word, such as "cock," which is a slang term with a much different meaning.