There is no definition for 'fangoriously' in any known work save the prestigious literary achievement of Strong Bad, "Everyone is different". This phenomenon is called hapax legomenon, when a word only appears once-ever. We can deduce from context, however, that fangoriously has something to do with the manner in which gelatinous monsters digest their food.
A more specific replacement for the slang use of "gay" ie. not good, bad, no good, un-cool,crappy, soft, unsuitable, or incompetent, without confusing the listener with an unnecessary general reference of preceived sexual orientation.