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The northwest form of a Cleveland Steamer. It is critical that you eat a large quantity of Mexican food before preforming the Seattle Tugboat so that you have diharria. You then crap on the girl's chest and slide down with a "toot toot" noise, more like a tugboat.
Dude 1: Man I gave this chick a wicked Seattle Tugboat last night!
Dude 2: I didn't know you had a girlfriend!
Dude 1: No, man it was your girlfriend!
by TJ_01 October 14, 2008
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