"Hankie pankie" is a colloquial term referring to flirtatious or sexual behavior, typically used when the behavior is considered questionable or inappropriate. Synonyms for this term include "hanky-panky," "fooling around," "playing around," "flirting," "roguery," and "tomfoolery." Other synonyms may include "mischief," "indiscretion," and "impropriety." While these terms may not always have the same connotation as "hankie pankie," they are often used interchangeably in reference to inappropriate behavior in relationships or social situations. These synonyms can help to add variety to writing and conversation while maintaining the same general meaning.