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Based off of a term used to describe those little impulse buy cubes of fudge you can find at convenience stores, "Impulse Fudge" refers to the act of surprise anal intrusion. When having sex with a female vaginally, all one has to do is switch immediately from V to A, maintaining the same thrust without announcing it. Girls usually don't like it. You can preface it with a joke also.
"Knock knock."
"Who's th-"
"Impulse fudge!"
by Bebiznizzle July 04, 2009
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