When a girl gives a hand job by rubbing the penis or shaft between the ring finger and middle finger making the "live long and prosper" gesture with both hands overlapping each other and squeezing the penis while moving up and down the shaft. They may occasionally incorporate the scrotum using the same hand gestures with one hand while "scissoring" the fingers to apply pressure. When done correctly, the receiver my start speaking Vulcan before climax.
Guy 1: My girlfriend gave me a Spock job for the first time last night.
Guy 2: Awesome, how was it bro!?
Guy 1: Dif-tor heh smusma!!