The apex of the big 3 core's (hardocore, x-core, and max-core.)
Derived from the imfamous x-core seen extensively on myspace.
Can be used to mock or praise, as shown in the examples.
(After the spotting of an overly made-up emo)
Spotter: Damn, did you see that emo *laughs*
You: Yeah, she was so max-core.
(After spotting a well designed t-shirt)
You: That shirt is max-core!