What is Mm/?
1.
Too Much Fucking Metal For One Hand
That Concert Was Fucking Awesome mm/
2.
too much metal for one hand. done by putting hands in fists, putting them together (like the m's) and sticking up both your pinkies
woah slayer is way to heavy better switch from m/ to mm/
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1.
When something wrong happens, or something bad.
For example, you buy your favourite drink only to find that you bought the wrong flavou..