The merging of two famous people's names into one
EX: Brangelina is totally the hottest celeb couple, and their name is such a cute mergaling!
EX: Bennifer is the mergaling name for Ben Affleck and J.Lo, but they have been broken up for a while now.
on the phone and in person mergaler is meant as a good bye OR a hello. but online it's used as a filler word. Something such as yeah or yerp
Mergaler! = good bye, love you (in person, on phone)
Mergaler = meh, yeah yerp, filler word (online)