A term used when a person has totally owned something, or done really well. Usually used in reference to a test, sport, or other personal trial. The term can be reversed to imply failure.
"Dude, how did you do on that test?"
"I totally anally penetrated it, I got a 99%!!"

or:

"How was your hockey game?"
"Ugh, we lost 0-11, the other team totally anally penetrated our goalie!"
by Babisarous Sex February 17, 2009
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The Angle of the Dangle x The mass of the ass = The heat of the meat
What is the formula to ass fuck someone? -Arbiter

look it up. its called the Anal Penetration Formula. -John
by Killerflash25 October 09, 2017
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A reference to penetration of the anus by or with a phallus (generally a penis or dildo) that is attached to a muffin. Known semantic variants include:
1. The act or event of anal penetration by or with a phallus that is attached to a muffin.
2. In an act of anal penetration by or with a phallus that is attached to a muffin, any of the following: the baked part of the muffin; the attached phallus; or the entire muffin+phallus apparatus.
3. Any reference to the online video "Anal Penetration Muffin," which can be found on several Web locations, including: http://www.dailymotion.com/video/x8p38x_anal-penetration-muffin_fun. The aforementioned video appears to be a spoof of comedian Liam Kyle Sullivan's highly popular "Muffins" video (http://www.youtube.com/watch?v=UlovHdFd_W4).

At the time that this definition is being written, the phrase "anal penetration muffin" and its close cousin, "anal muffin," have only become common in certain West Coast cities—namely (to this author's knowledge), Los Angeles, San Francisco, Portland, and Seattle.

Real-life instances of anal penetration by muffin have yet to be verified.
1. "I'd rather get an anal muffin than eat your mom's nasty lasagna!"

2. "Man, your new haircut's whack. Your head would look better as an anal penetration muffin."

3. "Aw, shit! Fuck! Granny-slappin' anal penetration muffin! I totally forgot the final paper's due today!"
by ®© April 13, 2009
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Two turgid cocks up one tight little poo tube
I am a good Christian I may be gay for pay but I would never stuff my cock into a massive great ass hole with my cock touching another surely that would create far too much truffle butter no matter what day of the week it is so I am dam sure Double anal penetration is slightly wrong
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