noun, the joyous feeling of doing something (normally alone) you know you should be ashamed of, for example watching Pets Do The Funniest Things or laughing like a drain when a little girl falls down & cuts her knee.
David walked into the bedroom to find a surprised Victoria dancing in her pants in front of the mirror singing The Final Countdown into a deodorant can at the top of her voice.
David; "Now that's entershamement!"
verb, noun, the process of being entershamed, ie enjoying a solitary activity which would be shameful if exposed to a wider audience.
Charles was entershaming himself rubbing the corgy's food into his member when suddenly in walks her maj.