Top Definition
A common phenomenon one experiences during the first couple of days (or in some cases, months) after attending a Model United Nations (MUN) conference. Somewhat like what an addict goes through during withdrawl.
Leah: Do you remember that one time at NAIMUN (North Atlantic Invitational Model United States) when we were at the Delegate Dance and you looked like a complete psycho?
Clare: Holy shit, yes... but don't talk about NAIMUN I'll relapse into serious MUNdrawl.
by sc00b May 29, 2009
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