A man, a goat, and a dog.
I heard they caught Earl in a Mississippi 3-way last night.
by H. Pants March 14, 2012
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The most deplorably, heinous act of participating in sexual congress with one's "sister" and "mother" at the same time.
Now Virgil I'm gonner tell ya, last Saturday night was a real hum-dinger. Me and my sister Tootsie-Lou was "bumpin' nastys" all hot and heavy out in the barn and then come Maw bustin up in there like wildkat demon in heat and hollered "Woooooo Weeeeeee!!! I sho do want in on this here so don't y'all be stingy with the stank!!!"

Well lo and behold! There I was all up in the middle of my first Mississippi 3 Way!!! I figger I'm ready fer big city livin' now!!!!
by Ted Snisha October 14, 2023
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