skullduggermy
Crafty deception or trickery or an instance of it used to obtain oral sex - as in skull me.
I made a suckers bet with her that I could tell her where she got her shoes and that I would take her to the mall if I was wrong and she would have to blow me if she was wrong. I told her on her feet and she had to blow me. It was a clear cut case of skullduggermy.