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deadmau5 – Professional Griefers (feat. Gerard Way) Lyrics 11 years ago
Silly kids. The term "griefer" was around before Minecraft was. A griefer is anyone whose goal in a game is to cause other players grief, hence the name. Lots of kids end up being griefers or doing at least some griefing because they have some sort of angst and want to take out their emotions on others.

The chorus --
"Gimme the sound, to see
Another world outside that’s full of
All the broken things that I made"
-- suggests that griefers live in their own little bubble of pleasure. They aren't taking into account the perspective (outside world) of those they are griefing. It's possible that the artists are suggesting griefing having a larger effect on the outside world. Alternatively, they could be relating gaming griefing to IRL griefing. It's also possible that they're just making an epic out of game griefing.

With regards to "teenage girls with ESP", ESP is extrasensory perception - the unexplained phenomenon of people perceiving things not using the traditional 5 human senses. This is often referred to in science fiction and the graphic novel universe.
Regarding "boy with bombs in NMA", NMA (No Mutants Allowed) is a game community website focusing on post-apocalypse games.
Morning sickness was explained by another commenter.

Given this combination of items, I'm led to believe the song is just a cross between teen angst and game griefing - possibly that one is the cause of the other or that they are cyclical in cause.

Or they just wanted something totally badass.

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