angry hitchhiker
The Angry Hitchhiker is a move used during sex by the man to stimulate his girl. It's done as the two are slipping into position to 69. It involves the man sticking his thumb in the vagina of his lady when her backside is exposed to him. The man then thrusts his thumb back and forth ferociously, just like a hitchhiker does when they are mad that they haven't received a ride yet. Typically happens when one honks or waves when going by the hitchhiker.
Adam and Sandra were getting it on. Adam suggested 69 and Sandra moved into position. When she got in place and was giving Adam head, Adam inserted his thumb into Sandra's pussy and gave her the Angry Hitchhiker. She sucked him off like never before.