What Is the Definition of Kinky? According to the Collins Dictionary, if someone describes something as kinky, they are likely referring to sexual acts that are unusual, strange, and possibly exciting . In human sexuality, kinkiness is the use of sexual practices, concepts or fantasies that are not conventional. The term derives from the idea of a "bend" (cf. a "kink") in one's sexual behaviour, to contrast such behaviour with "straight" or "vanilla" sexual mores and proclivities. Explore the definition of the word " kinky ," as well as its versatile usage, synonyms, examples, etymology, and more. Kinky sex is a broad term for consensual sexual practices that involve fantasy, role play, or power dynamics. Learn more about kinky sex and what it means in relationships.