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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This is a combination of a Cleveland Steamer and a Motorboat. It is when a man (or woman) excretes feces on a woman's breasts and then Motorboats her.
Man 1: Dude my friend Steamboated his lady last night.

Man 2: NO WAY! That is the Grossest thing I've heard of!!
by MRuka07 October 29, 2010
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Steamboating is a sex act that involves farting into a plastic bag and then putting the fart-filled plastic bag over your partner's face to let them inhale your farts.
Kelly: Josh wants me to steamboat him. Should I?
Jenn: What's steamboating?
Kelly: Um it's kinda kinky... it's when you fart into a plastic bag and then let your partner smell it.
Jenn: Oh! Ben and I do it all the time! It really turns him on!
Kelly: Guess I should too then...
Jenn: You should! It's the best
by Crepescular Monty November 17, 2010
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Act of jiggling head left and right between an older woman's breasts. See Motorboating
Jay picked up Ethle from the retirement castle, took her to a nice steak dinner, and got to steamboat her flapjacks.
by Andysue28 January 15, 2015
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When a man or woman straddles their partner and has a bowel movement on their chest or stomach. This is referred to as the steamboat because it was said to have originally happened in an outdoor winter setting, which caused the fecal matter to give off steam once released.
Billy and Cindy wanted to take their relationship to the next level. Boy was Cindy surprised when Billy gave her a steamboat while sitting next to her parents hot tub.
by HDC October 9, 2004
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Inhaling marijuana smoke trapped in a toilet paper roll or similar device.
Luke: Hey, get that toilet paper roll out of the garbage for me.

Suzzy: What for .. ?

Luke: Trust me ~ you'll love this. I'm gonna give u a steamboat.
by MoonCricket July 23, 2005
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An incredibly fat doobie, rolled densely with medicinal cannabis. A steamboat Jackson burns slowly and evenly throughout.
by Biggest Aristotle January 4, 2012
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