A combination-acronym, or combi-nym (for short), of OMG oh my god, WTF what the f***, FML f*** my life, and KMN kill me now.
Used to represent complete confusion and resulting suicidal wishes.
Alternatively: An Uber-parody of internet acronyms
Person 1: Wouldn't it be cool if Justin Bieber was in rockband
Person 2: Yeah, he's such a good musician.. he'd totally rock out