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Occurs when your female partner is giving you a blowjob and then you cum in her mouth. Superbly she goes to swallow your load when you jam your cock in farther causing her to choke. This movement naturally re-routes your discharge through and out her nose creating the "Hangin Brain".
Due to Sara's superb oral efforts, I gave her a little extra. She smiled up at me with surprise exposing her new hangin brain.
by Sugar Sump December 07, 2006
The act of exposing the scrotum out the fly hole of your pants.
It was a real blast hangin brains back in high school.
by roocat71 February 21, 2003