Can also be used as an adjejctive to describe charachterisitics of melo users/general melodrama, or a verb "to melo" i.e. to update your journal or browse those of others.
"Stop being so melo! You'll be crying when you wank off soon!"
"I haven't melo-ed in a day.....I think I have withdrawal symptoms"
Emo kids, or kids who try to be emo are referred to as "Melo" or "Melodramatic" because of their attention seeking and lack of relevance in situations.
Ashley: Jeff, stop being so melodramatic.
Jeff: NO! YOU RUINED MY LIFE! I'M GOING TO GO CUT MYSELF!
Ashley: Oh for fuck sakes... You fucking melo.