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When a male engages a female in anal intercourse from the rear, with such force that his member penetrates deep enough to injure her, causing the glans of his member to emerge from her vagina.

The "head" of the "turtle" would likely be covered in "mud", enhancing the illusion.

This fantastical sexual feat was imagined in order to win a gross-out contest in Denver, CO.
"Holy shit, that dude is bangin her dirtchute so hard he's burping the turtle!"
by BigMDub, ZachDB, Cpt. Pickard August 07, 2012