The "driving pleasure" you get from being behind the wheel, while also receiving head. Upon ejaculation, you must slam your car into any vehicle next to you.
At the young age of 19, Billy Johnson was pronounced dead after he had his first farfanugen with his ex, Lila VanFox, age 17.
Farfanoogin is the way a moron pronounces Fahrvergnügen, a German neologism meaning "driving enjoyment." It is often parodied or used when the speaker does not speak German, but wants to use a German word.
Moron: "Did you see that Germanguy? He's a real farfanoogin if you no what I mean."
Normal person: "I don't even know who you are. Why are you in my house?"