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1. Corruption of the word "infusion" to describe the practise of chemically altering or spiking the drink of a person, usually underage, for sexual gain. Commonly attributed to paedophilia and child abuse.

2. The foul-smelling discharge emitted from the rectum after unprotected anal intercourse, from the combination of semen and faeces.
1. "Sinfusions are illegal."

2. "The sheets were smeared with sinfusion and rank sweat."
by Daniel Price May 14, 2006
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