When a student is studying hard, they get a butter chicken prize. If a student gets the butter chicken prize, the sheer deliciousness of the butter chicken will prompt them to exclaim "MOTHERFUCK!", as yelling "MOTHERFUCK!" is an involuntary reaction to tasting some delicious butter chicken.
This phrase originates from the video "Cooking Curry During College Lecture!", by Fique, in which he says the phrase: "student studying like a hard boy, giving a butter chicken prize", while he is cooking butter chicken in class. This video is also the origin of the "Ding Dong Eat It Up" meme, which quickly blew up in popularity.
"LET'S FREAKING GO I FINALLY GOT A BUTTER CHICKEN PRIZE! MOTHERFUCK!"-good student