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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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 02, 2005
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The act of taking a hit of weed then going under water and blowing out all the smoke. The bubbles will then pop at the surface of the water and smoke will come out resembeling a steamboat.
Randy: Bill you'll never believe what happened last night at Joey's house.

Bill: What the hell happened man?

Randy: We were all in the hot tub smoking some white widow and i looked over at waka and he was doing the mother fucking steamboat.
by WakaFlockaFlame9559889 March 11, 2010
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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 27, 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 February 28, 2011
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The act of inhaling marijuana smoke, then exhaling it while performing a standard motorboat
Guy 1: what did you do with that girl last night?

Guy 2: we were smoking a blunt and I steamboated her titties.

Guy 1: Nice!
by I<3 Smokin' Titties October 29, 2012
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