From RuneScape Classic Wiki
Abbreviation
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Meaning
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M, Mil
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Million (e.g. 1M = 1,000,000)
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Mage, Mager
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Referring to the Magic skill, a player who uses Magic more than Range or Melee.
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Mage tank
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Player with high Magic and Defence.
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Main
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A player's main character
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Maxed, Maxing
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When a stat has reached level 99 (e.g. maxed Strength); when someone hits their max hit on a person (maxing); or when someone has a combat level of 123.
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MB
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Mage bank (inside the Mage Arena in deep Wilderness).
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Mb
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My bad
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Med
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Medium helmet
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Mem, Memb
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Member
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Merching, Merch, Merchanting
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Usually means the buying of an item then selling that same item later on in order to make a profit.
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Mith
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Mithril
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