Actually pronounced "More Than Friends", this is a term usually used to denote friends who are also lovers. However, this term could logically describe any such pairing of individuals whose relationship "penetrates" beyond a simple, standard friendship. "We're more than friends, we're also cousins", or something. Yeah right. "We're more than friends, we're also taxidermists". Mmmkay?
"Jack and Jill were more than friends, they were also fellow hill-survivors".