Internet shorthand of "Me la pela". Spanish slang. Means" "sucks my dick/can suck my dick". Literal translation means "jacks me off". Used to express intense dislike of someone/something, or to express ones superiority over the subject in question.
Jusin Beiber MLP! = Justin Beiber can suck my dick!
In a fight between me and Justin Beiber, Justin Beiber MLP.