shake n' rape

When someone shakes your hand and unexpectedly caresses your palm with their fingers. Although the gesture is not always accompanied by a smile, the intentions of the shake n' raper are usually clear.

Luke: So I changed his oil and went to shake his hand and he gave me the old shake n' rape!
Jen: He did what?!
Luke: Yeah, he slowly stroked the inside of my palm with his middle finger and I swear he had a slight smile at the corner of his mouth.