Stigginit is a portmanteau of the phrase "sticking it to the libs (liberals)." The word apparently originated on Fark.com as a way to mock the practice of some conservatives who engage in a practice not because of merit or self interest, but merely because the practice is opposed by a liberal, especially in those cases where the practice is clearly against one's self interest.

the thing that you don’t have when you’re phones percentage is over 20

Slang form of "sticking it." Used to describe opposition motivated purely by spite, usually not in one's best interest. Can become its own reason for action.