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17.
The act of recieving oral sex from a partner and ejaculating in that partners mouth. And before that partner can "spit" the fluids out you wrap saran wrap around their mouth keeping the fluids in place as they slosh around. Creating a glass bottom boat effect.
Mo was totally giving oral to this guy last night and before he could spit it out he gave him a glass bottom boat.
by WBoz January 20, 2008
 
1.
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.
by Frank667788 August 21, 2006
 
2.
Defecating on saran wrap that's held over your partner's face
After dinner my partner treated me to a glass bottom boat ride.
by Jizzle March 18, 2003
 
3.
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.
by Dirty Buck Nasty March 29, 2010
 
4.
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.
Kelly did a glass bottom boat for me while i jacked off. She's such a freak!
by systemcontrol January 18, 2010
 
5.
A person lies underneath a glass table while another person deficates on top of the table.
At the party Luke was a passenger on a glass-bottom boat.
by Al Tonen April 05, 2004
 
6.
A sexual act that involves a person squatting and defecating on a glass table while another watches from below.
John paid the hooker for a glass-bottom boat but I had to clean it up.
by MeowMeow master March 11, 2010
 
7.
Jerking off underneath a glass coffee table while some slut drops trow and shits over you, onto the table.
by Talking Goat June 20, 2003