Jill in the Box 

The action taken such that when having sex in a car with a sun roof, the man thrusts upward so that the woman's (Jill) head emerges through the sunroof and moans in delight. Similar to the childrens toy the Jack in a Box especially when performed with random thrusts.

I was dogging in the park last night and whacked it while watching a Jill in the Box.

Jill in the Box by Flacido Domingo August 13, 2008