pinakanakapagngingitngit-ngitngitang-pagsisinunga-sinungalingan

Etymology
From with initial.

Noun

 * 1) the most fury-inducing lie

Usage notes

 * This is a tongue twister.
 * This word was invented purely to be a contender for the title of the longest word in the Tagalog language, comprising sixty letters and twenty-two syllables.
 * Technically, it can be longer by adding the ligature at the end.