A sexual maneuver in which the the girl is on top, facing the man, who is on his back. As she is riding him, a friend comes from behind and penetrates her anally, causing great surpise, or "jaw-dropping".
Steve was bonin' his girl, and Al decided to pull a Utah Jaw Dropper on her. Needless to say, that bitch freaked out!
by theyoneman April 3, 2007
Get the Utah Jaw Droppermug.