Originally from ThatGuyWithGlasses in his review of Alone of the Dark. When the doctor injects himself with the serum he says "MMMMM, thats good magophin!"
Can also be used as a hurmerous way of saying something is good, u can say MMMMM! thats good magophin!
Your eating Frosted Flakes and when u take a bite and say: "MMMMMM! Thats good magophin!"