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The act of infusing a person's anus with warm milk for the enjoyment of the receiver. Typically, a lightweight aluminum funnel is used to carry out the milk infusion in an orderly fashion.
My boyfriend allowed me to lactifuck him once, and now he is totally hooked on it. Doesn't want regular sex anymore, just hot milk in his ass. Boy, this lactifucking is a dangerous game!
by Alpro April 28, 2013
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