Turdface can be used in different ways depending on the situation. Most often used in place of butthole or asshole which are words usually associated with undesirable behavior from another person.
Tina Vermillion is a turdface for not cleaning up the fresh dog poop in the kitchen that smelled up the entire house.
Jim Wilke, or any other IRL fan who is too dumb to even classify as a full turd. The word "turdslice" is used to describe an extremely dumb motherfucker without insulting the class of dumbfucks and dipshits.
Jim, stop being a turdslice and admit that theIRL is gay!