A full Stanley is preferably performed by a gay Jewish midget or dwarf. It happens when an unsuspecting male (full sized) leans over a bar to give dap to the bartender and the little person reaches up and cups his balls with his little hands. It's ok if he is not Jewish, but he should be gay and small.
That dude just got the Full Stanley on his way out the bar. Man, that little dude is fucked up.