adjectives - "Science fiction-y"


I recently saw a TED Talk in which the speaker used the term "science fiction-y", making an adjective out of "science fiction". Is it ok to form your own adjectives in that way? If so, should there be a hyphen before the y (as there was in the captions). Are there other examples of similar constructs with a '-y' added to a term (rather than a single word)? Would science fiction-like be a better choice?




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