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The Dagnham Handshake is when a guy shoves his pinky up a girl's eye, slaps his fingers into her crotch, and lazily taps her clit with his thumb. It’s easier to do it from behind, but if you're a total showoff, you can do it face-to-face while staring at her boobs like they’re your new best friend.
He tried the Dagnham Handshake at the bar and got laughed out of the place.
My cousin did the Dagnham Handshake at the wedding and got a slap from my aunt.
I did the Dagnham Handshake in the grocery store and got a warning from the manager.