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!!
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