a phrase derived from the Korean drama Palace Goong. The princess exclaimed "Oh my god! Jesus Christ! Super Star!" when she saw her middle school picture, which is a picture of her in her fattest and ugliest days, on the newspaper frontpage. It's used to exclaim the unbelievabililty or incredibility of something.
"OhMyGodJesusChristSuperStar, Leehom Wang is the hottest guy on Earth!"
"Leehom Wang proposed to me."
"not something worthy to say OhMyGodJesusChristSuperStar"
"*slaps* We've been together for so long and finally =D"