BUPT is an acronym that stands for "Beef Until Proven Tofu" this is an internet law that says anything that resembles a beef(quarrel, argument, disliking..etc) can be taken seriously and instigated until, all active parties involved in the alleged "beef" say it's not serious or is just a joke.
James: Hey Quentin, did you see that twitter beef between Donald Glover and Lupe Fiasco!?
Quentin: It doesn't look serious, they're probably just joking with each other.
James: BUPT! It looks like a beef! So, until they say it's not, I'll believe it's serious!