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A sex act which involves a man defecating into a woman's mouth, then lying on his back while the woman then vomits directly onto his penis, forming a mound-like structure, not unlike naturally occurring geysers, around the base of aforementioned penis. The man then manipulates his own prostate, causing him to spray ejaculate into the woman's eyes.
"Yeah, she totally let me try the steam geyser last night. It's a good thing she was German."
by Fawlawl December 15, 2011
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