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To bang someone else right in front of your ex's whole frat or sorority after you two split up. People do it to get back at you or because they're total garbage.
I nabagled her in front of the whole Sigma Alpha Mu chapter. Her face was like a sad clown.
He nabagled my ex's best friend right in the dining hall. It was brutal.
I got nabagled by a guy who still had a crush on my ex. I felt like a total failure.