Pornography involving the insertion of live wriggling eels into sexual orifices. Primarily enjoyed by perverts, sexual deviants, eelophiles, and aquatic pet store employees.
Hank: "Dude, I was going through some of my dad's videos last night, and I found a bunch of eel porn!"
George: "That's messed up. People who watch eel porn are sick fucks."
Hank: "Why are you squeezing your legs together like that? What's coming out of your shorts? Eew, is that an eel?!"
Hank's dad: "Hi there, Hank! Say, who's your friend? I think I saw him in a video one time!"