Like motor-boating... but with an asshole.
Bro, I was totally steamboating that girl all last night *high five*
by x3igh7 September 11, 2011
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to be completley pissed out of your tree
"i cant believe i shagged that fat trout last night, i was fucking steamboated"
by supertad June 2, 2005
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To get completely, hopelessly and utterly drunk or "off yer face". Words and phrases of the same definition include "steaming", or "getting boats".
by m January 26, 2004
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derived from the use of steaming to mean drunk, steamboats means you were exceptionally drunk on a particular occasion
I drank too much last night, I was absolutly steamboats
by catormo February 15, 2005
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The act of exhaling clouds of loud in between some fat ass thot titties, thus creating the Mount St. Helen’s Effect of marijuana smoke gently escaping the crevous/air pocket formed between two pushed-together breasts.
I just walked in on Todd steamboating Heather and I’ve never smelled such dank shit before!
by Bert Durffle March 28, 2019
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Similar to motorboating.

Instead of placing one's face between a female's breasts, an individual instead elects to place his or her face between a woman's ass cheeks and performs the same actions one would do while motorboating.
Chuck: Hey Zach, what's that brown smudge on your nose?
Zach: Haha, I was just steamboating my girlfriend a few minutes ago and I guess I forgot to towel off
by RockSteady22 March 1, 2011
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Over the years the original name has faded. More and more people today identify such devices as a steamroller.

According to A Child's Garden of Grass: The Official Handbook for Marijuana Users (1969, Jack S. Margolis & Richard Clorfene) "A steamboat is a combination of a pipe and a joint merging the best of both into a powerful tool of good."

While a true pipe only has two holes (a bowl and mouthpiece), the steamboat has three (a bowl/joint holder, mouthpiece, and a rear hole nearest to the bowl).

To use a steamboat one covers the rear hole, puffs a few times upon the piece to fill the chamber, and then uncovers the rear hole to puff once more - inhaling the full contents of the chamber.
"Some inveterate critics may claim that these are not Steamboats, but pipes. They're not. They're Steamboats. A pipe has two holes, a steamboat three or more."
- A Child's Garden of Grass
by lokomis January 21, 2008
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