To lift one’s leg in the air, like a cat, and reveal one’s butthole. Often done spontaneously and to surprise others. Requires flexibility to lift one’s leg nearly vertically. See film Cats (2019) for reference.
Girl to friend: Can you believe Britney?! She just Judi-Denched herself and then kissed her boyfriend. Iconic.
Chad: Bro, I met this girl on Tinder that wants to watch me Dench. Should I go for it?
The act by which a man, showing complete lack of moral fibre and control, completely loses it with one of his mates and acting like a complete bitch throws his beer all over him.
"Hey did you see Chris lose it the other night, he lost it with Andrew and gave him a complete bitch drenching...threw his entire pint over him. He really needs to harden the fuck up."