No, it's not an acronym.
Short for tifosi, tifo is the choreographed banners, smoke, chants, flags, etc. of supporters to create a visual that can inspire, motivate, and intimidate. In Portland, tifo has always been an important, independent, and creative part of supporter culture. Riveters tifo is funded by the 107 Independent Supporters Trust and created by volunteers.
in Portland anyway
The Second Rule of Tifo is do not talk about tifo.