PPB is an acronym for Pig Poop Balls.

It is a gag dated back to the Dark Days of Reddit, where there were regular posts about, "Well, actually, homelessness is good in the free market pee pee poo poo I am very intelligent."

As they were not engaging in good faith, we, too, chose not to engage in good faith. Thus, we sent them photos of a prize hog defecating on his own testicles. The tradition of sending PPB to bad faith actors carries on to the present day.

It is very funny.