A person who is prone to outbursts of an excessive nature, usually over petty subject matter.
That fat lady (over there) is a coniptionista. All it takes is the slightest reference to something being overweight
and she blows up
. Often she gets outraged because people move out of the way as she lumbers down the street and moves into full coniptionista mode
by launching into a tirade
about prejudices inflicted
on fat people, how requiring a fat person to purchase two seats on an airplane was unfair just because they are over 500 pounds, that there is a conspiracy by ruthless corporations to hypnotize people to overeat, how fit people are really fat people with low self-esteem, and so on. A coniptionista is very easily inflamed and readily seeks obscure reasons to explode and cause tension. Full coniptionista mode is achieved by foregoing all formalities and swearing in a manner that would embarrass sailors.