term used to describe a really good band or a group of really good looking people that play musical instuments. Usually used to descibe an awesomely good British pop band.
dude 1: hey, did you see that band play at the club last night?
dude 2: no, but i heard they were really Mcfly!
me: mcfly is the awesomest band in the whole entire world and even though danny doesnt realize it yet, we are going to get married.