1. A mechanic whose primary responsibility is to maintain a well-lubricated engine so that it can fire on all pistons without the shaft getting stuck.
2. Someone who gets extreme pleasure or excitement from secretly browsing photos of expensive supercars.
"The car's engine isn't dead. We just need a skilled pornochanic to look under the hood."
"Sweet desktop wallpaper!"
"Dude, don't you ever knock before you enter a room?!"
"Whatever. We all know you're a major pornochanic."