Glass boat 

A sexual act - One partner lies on their back and covers their face with saran wrap. Then the other person defecates onto their mouth (with the saran wrap acting as a "glass" barrier for the turd "boat".

I couldn't glass boat last night. My stool was runny.

Glass boat by Dwane October 19, 2003

glass bottom boat 

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.

Your grandfather got arrested in Thailand again after paying an underage transvestite hooker for some ]glass bottom boat] action.

glass bottom boat by Frank667788 August 21, 2006

Glass bottom boat 2 

One person lays under a glass coffee table jerking off while the other person squats over the table takes a shit. Then after the guy cums the girl or guy pisses on them.

Hey DJ can we do a glass bottom boat 2?

Glass bottom boat 2 by Smashley420420 March 6, 2014

Glass Bottomed Boat 

This is for poop freaks that might not want to go all the way. Person A (the shitter) and person B (the target a.k.a the person "shat" upon) Person B lays under a glass top coffee table while looking up. Person A takes a dump over the persons face, or other appropriate area of choice. Thus simulating being "pooped on" without all the mess. (I belive the smell could still be an issue)
origin: unknown, though based on glass bottom boats used to watch fish .

"After we scored few lines of coke off my glass topped coffee table, I climbed under it and had my "lover" straddle on top, with her cheeks spread. Her ass opened like the mouth of a lamprey and deposited a big healthy turd over my face. I licked the glass as if I were a fish under a "glass bottomed boat"

Glass Bottomed Boat by Morbog September 27, 2004

Glass-Bottom Boat 

latin: Traba crystalis

In this perfect addition to foreplay, one partner lies beneath a glass coffee table while the other squats above it and unloads. Like viewing the colorful sea life from the relative safety and serenity of a glass-bottom boat, this simple maneuver is not only arousing but biologically tantalizing.

I've been to Hawaii. I've seen all of those fish---its what every tourist does. It's neat and all, but never blew me away. But getting to see my Bobby in action, doing that Glass-bottom boat for me, seeing that magical human process going on in front of me . . .well, I just felt like a science student all over again.

Glass-Bottom Boat by Dirty Buck Nasty March 29, 2010

glass-bottomed boat 

Defecating onto a piece of plastic wrap held snugly above your lover's face. This provides the view similar to a glass bottomed boat. See also: bradar

Hi lover...you want me to crap on your face? or would you like a glass-bottomed boat today instead? I am feeling dirty...rrrrrr.

glass-bottomed boat by foug December 15, 2003

glass-bottom boat 

Defecating on saran wrap that's held over your partner's face

After dinner my partner treated me to a glass bottom boat ride.

glass-bottom boat by Jizzle March 18, 2003