What is Hankey Pankey?
1.
When you have hidden, but dirty ronchy sex with someone.
Hey! I know you crazy kids are in that room. Stop your god damn hankey pankey, ya here?
See
2.
The performing magician's art of distracting the audience while surreptitiously playing tricks on them.
He kept distracting us with hankey pankey so we didn't notice how he pulled off the the stunts.