McNistian Share definition Flag The religion in which one must be a true madbowlchillen dude. Derived from the town of Milton. Man, I recently converted to become a McNistian. Ever since all i've done is madbowlchill. McNistian by HOLLLA- TDOT October 1, 2008 0 0 Get merch Get the McNistian mug. Buy Now — $32.95 See more merch