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1.
A subtle move (usually preformed by a guy on a girl but can be vice versa) where the guy places his hand on the chicks thigh. Then he gently sweeps his pinky along the broads inner thigh.

The function of this move ranges from displaying an indicator of interest all the way up to the start of floor play. More advanced Pinky Sweepers (N) have been know to accomplish both in the same seating.
"I used the Pinky Sweep to see if she's DTF"
"Bro, that Pinky Sweep lead to a fat cup caking session.

"Once I saw Mitch go in with the Pinky Sweep I knew I had to play a defensive wingman"
by Mad Dog Mike November 07, 2011