How do I 'MUN?'

Model UN (MUN) - proper noun.  An organizational simulation in which students learn about diplomacy and international relations, as well as engage in simulations from the United Nations.

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MUN: - verb.  The act of engaging in simulations, writing position papers, negotiating as a member state with other member states from that position.
See also: superhero, coolest MSHS club, best after school activity, 'Nerd Herd', Steiner's Children