The act of taking a crap on a person's back while they are laying out in the sun, leaving a nice pile of shit tan line.
Jon left a steaming "J" on April's back, she's gonna have one hell of a Miami Steamer tan when she wakes up.
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When you take a hot shit on someone during a sexual act on the beach in southern Florida.
Dude, this girl gave me a Miami Steamer last night and it couldn't have felt better.
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