the REAL definition:
when you put saran wrap on your chest and someone takes a shit on it and you flip the saran wrap into your face

people have ACTUALLY done this... and i have no idea how fecal matter is sexually stimulating but whatever floats your boat i guess... i made a funny.

A sexual act in which the customer lays under a glass coffeetable and looks up through it, while their partner defecates on the top. How some people find this stimulating I'll never know.

Also can refer to the same positioning with a coffee table but the person on top merely presses their genitals onto the glass, for "squashed" visual effect - or can refer to defecating onto someone's face which has been first covered in plastic kitchen wrap like Saran Wrap.

When a person shits on on top of a glass table, while someone under neath masturbates to it. like as you would watch fish in a real glass bottom boat.

To place plastic wrap on someone's face and then proceed to defocate on it.

When one puts seran wrap on anothers face, poking holes for respiration, and taking a dump on the others face with the seran wrap still on there face. The seran wrap acting as a "Glass Bottom".

place cling wrap over someones faces and shit on it

when you put plastic rap over your face and have someone shit all over your plastic covered head.