Top Definition
ejaculating on a face or ass quickly followed by a smack and gentle rubbing to create a marbled finished.

For more depth, let dry and repeat.
"I Venetian Plastered that ass last night."

"I really wanted to Venetian plaster her face, but I'm not sure we're at that level in our relationship, yet."
by Crystal24 October 19, 2014
when a man ejaculates into his own hand and then paints it artfully on his partner's backside or face using a broad stroke, swiping motion. (think wax on wacks off)
That guy in Silence of the Lambs in the prison, when he threw his jiz at Clarice, he was the Jackson Pollock of Venetian Plaster.
by Red Box July 13, 2010
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