The correct spelling of the word "joint jack ass" is actually "joint-jackass". This term refers to a person who is prone to causing trouble or mischief, typically in a group setting. "Joint" in this context is an adjective meaning "shared" or "common", while "jackass" is a slang term for a foolish or obnoxious person. The phonetic transcription for "joint-jackass" is /dʒɔɪnt ˈdʒækæs/.