hanky-panky
/ˈhæŋkɪˈpæŋkɪ/noun
mass noun
- informal, humorous behaviour, in particular sexual or legally dubious behaviour, considered improper but not seriously so〈非正式, 幽默〉不正当的性行为; 财务上做手脚的行为; 欺骗行为：
suspicions of financial hanky-panky.
财务上手脚不干净的嫌疑。
词源
mid 19th cent.: perhaps an alteration of HOKEYPOKEY.