It's possible it could be:
* A nickname for someone named June. This is the most likely scenario.
* A regional slang term. It's possible "juney" is used in a specific area with a unique meaning.
* A misspelling. Perhaps it's a typo for a different word entirely.
Can you provide more context? Knowing where you encountered this word would help me understand its intended meaning. For example, was it in a conversation, a written text, or a song?