The term "titi" appears to be a misspelling or slang term for "tit," which refers to the breast in adult content. This could be used as a tag for videos featuring breast stimulation, nudity, or breast-related fetishes. Note that "titi" might not be an English term, and its meaning may vary depending on the context or language it is being used in. Always ensure you understand the intended meaning of a term before using it to search or tag pornographic content.