Italian-Americanised mispronunciation of the phrase "Va'a fare in culo" (literally "go do it in the ass") often shortened to "vaffanculo", or just "fongool".
Elvis, Elvis, let me be!
Keep that pelvis far from me!
Just keep your cool
Now you’re starting to drool
Hey fongool, I'm Sandra Dee!
(Rizzo, from the musical Grease)