Wisconsin One Way Window
The simple act of shitting into a lovers mouth, then quickly but lovingly wrapping his/her face in saran wrap. Thus allowing them to see the light of being able to spit it out but not being able to much like a one way window.
I gave Heather a "Wisconsin One Way Window" she was down with it until she finally spit it out and got pieces of corn stuck in her teeth, that she felt was over the line.