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having sex with a girl doggy-style in the pool, in deep enough water that she has to keep paddling to stay afloat.
"I was in the pool with Catherine, and we ended up steamboating! The huffing and puffing when she ran out of breath only made it better!"
by Sinker23 May 23, 2006
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the act of motor boating your anus on a females breast and letting out subtle, noiseless farts.
"hey Johnathan, i bet you wont ask that lady is you could steam-boat her."
"whats steam-boating"
"you know farting on her tits"
"oh, well here i go"
by Racial_slut January 26, 2018
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