‘multi-hyphenate’ is a noun used for a person who has (or is known for having) several main occupations, such as a television-writer-director-turrned-film-writer-director.
This word was first used in 1969 by Wayne Warga of the L.A. Times.
New words enter our language every day. If a word is used enough times or describes something that no other word seems to fit, it becomes part of our language. That is why the English language is called a “mongrel language”.
I think you mean multihyphenate.
An example would be when a person is described as “an actor-writer-director”. There is more than one hyphen in the title hence the multihyphenate description.
I hope this helps