A long session of watching a great deal of movies and/or TV shows involving the fabulous British actor Benedict Cumberbatch. A marathon of BBC's Sherlock would be considered a Cumberbinge, for example. Side effects of this activity may include, but are not limited to, helpless squeeing, desperate longing, insane happiness, cravings for tea, biscuits, or other typically British foods, and an increased admiration for Benedict Cumberbatch's cheekbones, if such a thing is possible.
Girl: I was going to do homework, but instead I ended up on a massive Cumberbinge. Oops.
Fangirl 1: Want to have a sleepover? We can go on an all-night Cumberbinge!
Fangirl 2: Ohmygoodness yes! I love him! I'll make tea, shall I?