adj. - contagious, addictive, esp. with music - not always used in a positive sense. Etymology: a "mashup" of the words contagious and Fious. Fious is a city in Cameroon, a West African nation with a substantial petroleum industry. In this context, the reference to Fious is a reference to the Western addiction to oil as an energy source, meaning that 'Fious' is used as a stand-in for 'addictive.'
Ex. "I don't really like that Diddy song, but it's so contafious."