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1. steam boat
1. to be very highly intoxicated on copius amounts of alcohol, to the point where you can just manage to walk

2. a chant which is shouted by yourself and a group of friends when you are leaving the pub/club/bar and are walking down the street, after a heavy drinking session
1. ah man, me and the lads had a great night, we where so steam boat it took me 2 hours to walk half a mile home.

2. me and the lads where shouting "STEEEEEEAM BOOOOOAT" all night last light, and we woke some old lady up!!
2. steam boat
(verb) To defecate within the cleavage of unsuspecting female, with intent to follow standard motorboating protocol.
Oh man, last night I took my date to the mexican restaurant down town and then I totally had a hot steam boat later
3. Steam Boat
Giving a guy a blow job while he is taking a poo.
"Honey can you get in here? I need some extra help taking care of this one. Maybe if you gave me s Steam Boat it would come out a little easier".
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