When you shit your brains out, and your brain seeps onto the floor resulting in extreme pain.
Dude, I just anal beefed your mom last night!
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When you and your girl are doing anal and your girl takes a load on your wiener and you didn't pull out and then she farts and her load flies on your face.
*EDUCATIONAL PURPOSES.
"Yo, she just anal beefed on him!"
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