bumstabation

Masturbation involving the insertion of an object (preferably a dildo) into the anus.

I couldn't get an arse fuck, so I indulged in a little bumstabation instead

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bumstabbing

Quickly and painfully inserting the penis into a woman's anus forcefully, especially at an unexpected time.

"My girlfriend and I were fucking last night, and I felt like bumstabbing her. I now live on the street."

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