When someone finds extreme pleasure (often erotic), out of an otherwise painful or horrible situation.
Man, Jesse got Gunkelfucked last night. We paid this married townie $10 to beat the piss out of him all night, and he was loving every second of it. She even told us that when she backhanded his thunder penis, it was hard as lightning.
A trip to a grocery store, convenience store, or gas station for the sole purpose of buying an excessive amount of junk food and sugary drinks, usually with friends. A chud run often happens late at night and ends with everyone involved hating themselves afterwards.